zebra: Remove rib_lookup_and_pushup function

zebra: Remove rib_lookup_and_pushup function

The rib_lookup_and_pushup function, from what I can tell, was
used more when static route processing and connected routes were
more closely integrated in zebra.  The goal was when we were adding
a new address to remove the connected route and then allow processing
of the new address.  With the re-org a few years ago to seperate
out connected routes as well as static routes, I believe this is
no longer needed.

on BSD, without this code change we have this log:
2021/08/05 14:33:38 ZEBRA: [QEVVE-G3FQQ] rib_meta_queue_add: (0:0):10.40.30.0/24: queued rn 0x802022bb0 into sub-queue 4
2021/08/05 14:33:38 ZEBRA: [ZPR30-5G1FB] Kernel: Len: 200 Type: RTM_DELETE
2021/08/05 14:33:38 ZEBRA: [V3NSB-BPKBD] Kernel: GATEWAY DONE PROTO1
2021/08/05 14:33:38 ZEBRA: [HDTM1-ENZNM] Kernel: message seq 15
2021/08/05 14:33:38 ZEBRA: [MJD4M-0AAAR] Kernel: pid 53305, rtm_addrs {DST,GATEWAY,NETMASK}
2021/08/05 14:33:38 ZEBRA: [Y9Y5K-JJ7NT] rtm_read: got rtm of type 2 (RTM_DELETE) addrs {DST,GATEWAY,NETMASK}
2021/08/05 14:33:38 ZEBRA: [V17DT-1FJEN] kernel_rtm: 10.40.30.0/24: successfully did NH 9.8.6.7
2021/08/05 14:33:38 ZEBRA: [ZPR30-5G1FB] Kernel: Len: 164 Type: RTM_NEWADDR
2021/08/05 14:33:38 ZEBRA: [V3NSB-BPKBD] Kernel:
2021/08/05 14:33:38 ZEBRA: [HDTM1-ENZNM] Kernel: message seq 4664
2021/08/05 14:33:38 ZEBRA: [MJD4M-0AAAR] Kernel: pid 0, rtm_addrs {DST}
2021/08/05 14:33:38 ZEBRA: [M09CX-TKB4N] ifam_read_mesg: ifindex 1, ifname vtnet0, ifam_addrs {NETMASK,IFP,IFA,BRD}, ifam_flags 0x0, addr 10.40.30.1/24 broad 10.40.30.255 dst (unspec) gateway (unspec)
2021/08/05 14:33:38 ZEBRA: [MFYWV-KH3MC] rib_add_multipath_nhe: (0:0):10.40.30.0/24: Inserting route rn 0x802022bb0, re 0x8032973a0 (connected) existing 0x0, same_count 0
2021/08/05 14:33:38 ZEBRA: [Q4T2G-E2SQF] rib_add_multipath_nhe: dumping RE entry 0x8032973a0 for 10.40.30.0/24 vrf default(0)
2021/08/05 14:33:38 ZEBRA: [M5M58-9PD2R] 10.40.30.0/24: uptime == 1379355, type == 2, instance == 0, table == 0
2021/08/05 14:33:38 ZEBRA: [RVZMM-N7DME] 10.40.30.0/24: metric == 1, mtu == 0, distance == 0, flags == None status == None
2021/08/05 14:33:38 ZEBRA: [Q1NW5-NWY7P] 10.40.30.0/24: nexthop_num == 1, nexthop_active_num == 0
2021/08/05 14:33:38 ZEBRA: [TFHQ8-TC30H] 10.40.30.0/24: NH vtnet0[1] vrf default(0)  with flags
2021/08/05 14:33:38 ZEBRA: [SCETK-GQ9E4] 10.40.30.0/24: dump complete
2021/08/05 14:33:38 ZEBRA: [QEVVE-G3FQQ] rib_meta_queue_add: (0:0):10.40.30.0/24: queued rn 0x802022bb0 into sub-queue 2
2021/08/05 14:33:38 ZEBRA: [MFYWV-KH3MC] rib_add_multipath_nhe: (0:?):10.40.30.0/24 (MRIB): Inserting route rn 0x802022f30, re 0x803297340 (connected) existing 0x0, same_count 0
2021/08/05 14:33:38 ZEBRA: [Q4T2G-E2SQF] rib_add_multipath_nhe: dumping RE entry 0x803297340 for 10.40.30.0/24 vrf default(0)
2021/08/05 14:33:38 ZEBRA: [M5M58-9PD2R] 10.40.30.0/24: uptime == 1379355, type == 2, instance == 0, table == 0
2021/08/05 14:33:38 ZEBRA: [RVZMM-N7DME] 10.40.30.0/24: metric == 1, mtu == 0, distance == 0, flags == None status == None
2021/08/05 14:33:38 ZEBRA: [Q1NW5-NWY7P] 10.40.30.0/24: nexthop_num == 1, nexthop_active_num == 0
2021/08/05 14:33:38 ZEBRA: [TFHQ8-TC30H] 10.40.30.0/24: NH vtnet0[1] vrf default(0)  with flags
2021/08/05 14:33:38 ZEBRA: [SCETK-GQ9E4] 10.40.30.0/24: dump complete
2021/08/05 14:33:38 ZEBRA: [GCGMT-SQR82] rib_link: (0:?):10.40.30.0/24 (MRIB): rn 0x802022f30 adding dest
2021/08/05 14:33:38 ZEBRA: [QEVVE-G3FQQ] rib_meta_queue_add: (0:0):10.40.30.0/24 (MRIB): queued rn 0x802022f30 into sub-queue 2
2021/08/05 14:33:38 ZEBRA: [ZPR30-5G1FB] Kernel: Len: 240 Type: RTM_ADD
2021/08/05 14:33:38 ZEBRA: [V3NSB-BPKBD] Kernel: UP PINNED
2021/08/05 14:33:38 ZEBRA: [HDTM1-ENZNM] Kernel: message seq 0
2021/08/05 14:33:38 ZEBRA: [MJD4M-0AAAR] Kernel: pid 0, rtm_addrs {DST,GATEWAY,NETMASK}
2021/08/05 14:33:38 ZEBRA: [K0KVE-2GJA1] default(0:0):10.40.30.0/24: Processing rn 0x802022bb0
2021/08/05 14:33:38 ZEBRA: [RWCK7-TX4HT] default(0:0):10.40.30.0/24: Examine re 0x8032973a0 (connected) status: Changed flags: None dist 0 metric 1
2021/08/05 14:33:38 ZEBRA: [RWCK7-TX4HT] default(0:0):10.40.30.0/24: Examine re 0x8032970a0 (static) status: None flags: Recursion RR Distance dist 1 metric 0
2021/08/05 14:33:38 ZEBRA: [NYYJJ-0Q8QG] default(0:0):10.40.30.0/24: After processing: old_selected 0x0 new_selected 0x8032973a0 old_fib 0x0 new_fib 0x8032973a0
2021/08/05 14:33:38 ZEBRA: [RT9DY-ZS2KN] default(0:0):10.40.30.0/24: Adding route rn 0x802022bb0, re 0x8032973a0 (connected)
2021/08/05 14:33:38 ZEBRA: [PP3BZ-RABJN] default(0:0):10.40.30.0/24: rn 0x802022bb0 dequeued from sub-queue 2
2021/08/05 14:33:38 ZEBRA: [K0KVE-2GJA1] default(0:0):10.40.30.0/24: Processing rn 0x802022f30
2021/08/05 14:33:38 ZEBRA: [RWCK7-TX4HT] default(0:0):10.40.30.0/24: Examine re 0x803297340 (connected) status: Changed flags: None dist 0 metric 1
2021/08/05 14:33:38 ZEBRA: [NYYJJ-0Q8QG] default(0:0):10.40.30.0/24: After processing: old_selected 0x0 new_selected 0x803297340 old_fib 0x0 new_fib 0x803297340
2021/08/05 14:33:38 ZEBRA: [RT9DY-ZS2KN] default(0:0):10.40.30.0/24: Adding route rn 0x802022f30, re 0x803297340 (connected)
2021/08/05 14:33:38 ZEBRA: [PP3BZ-RABJN] default(0:0):10.40.30.0/24: rn 0x802022f30 dequeued from sub-queue 2
2021/08/05 14:33:38 ZEBRA: [K0KVE-2GJA1] default(0:0):10.40.30.0/24: Processing rn 0x802022bb0
2021/08/05 14:33:38 ZEBRA: [RWCK7-TX4HT] default(0:0):10.40.30.0/24: Examine re 0x8032973a0 (connected) status: Queued flags: Selected dist 0 metric 1
2021/08/05 14:33:38 ZEBRA: [RWCK7-TX4HT] default(0:0):10.40.30.0/24: Examine re 0x8032970a0 (static) status: None flags: Recursion RR Distance dist 1 metric 0
2021/08/05 14:33:38 ZEBRA: [NYYJJ-0Q8QG] default(0:0):10.40.30.0/24: After processing: old_selected 0x8032973a0 new_selected 0x8032973a0 old_fib 0x8032973a0 new_fib 0x8032973a0
2021/08/05 14:33:38 ZEBRA: [PP3BZ-RABJN] default(0:0):10.40.30.0/24: rn 0x802022bb0 dequeued from sub-queue 4
2021/08/05 14:33:38 ZEBRA: [GHWHS-ZKQM5] update_from_ctx: default(0:0):10.40.30.0/24: SELECTED, re 0x8032973a0
2021/08/05 14:33:38 ZEBRA: [TS3SH-1276M] default(0:0):10.40.30.0/24 update_from_ctx(): no fib nhg
2021/08/05 14:33:38 ZEBRA: [HKQXC-4STSK] default(0:0):10.40.30.0/24 update_from_ctx(): rib nhg matched, changed 'false'
2021/08/05 14:33:38 ZEBRA: [HBZNK-5H1X0] (0:0):10.40.30.0/24: Redist update re 0x8032973a0 (connected), old 0x0 (None)
2021/08/05 14:33:38 ZEBRA: [GHWHS-ZKQM5] update_from_ctx: default(0:0):10.40.30.0/24: SELECTED, re 0x8032973a0
2021/08/05 14:33:38 ZEBRA: [TS3SH-1276M] default(0:0):10.40.30.0/24 update_from_ctx(): no fib nhg
2021/08/05 14:33:38 ZEBRA: [HKQXC-4STSK] default(0:0):10.40.30.0/24 update_from_ctx(): rib nhg matched, changed 'false'
2021/08/05 14:33:38 ZEBRA: [HBZNK-5H1X0] (0:0):10.40.30.0/24: Redist update re 0x8032973a0 (connected), old 0x0 (None)

With this code change:

2021/08/05 14:41:24 ZEBRA: [MFYWV-KH3MC] rib_add_multipath_nhe: (0:?):10.10.40.0/24: Inserting route rn 0x802022f30, re 0x8021cbe60 (static) existing 0x0, same_count 0
2021/08/05 14:41:24 ZEBRA: [RT9DY-ZS2KN] default(0:0):10.10.40.0/24: Adding route rn 0x802022f30, re 0x8021cbe60 (static)
2021/08/05 14:41:24 ZEBRA: [V17DT-1FJEN] kernel_rtm: 10.10.40.0/24: successfully did NH 9.8.6.7
2021/08/05 14:41:24 ZEBRA: [ZPR30-5G1FB] Kernel: Len: 200 Type: RTM_ADD
2021/08/05 14:41:24 ZEBRA: [V3NSB-BPKBD] Kernel: UP GATEWAY DONE PROTO1
2021/08/05 14:41:24 ZEBRA: [HDTM1-ENZNM] Kernel: message seq 0
2021/08/05 14:41:24 ZEBRA: [MJD4M-0AAAR] Kernel: pid 60818, rtm_addrs {DST,GATEWAY,NETMASK}
2021/08/05 14:41:24 ZEBRA: [Y9Y5K-JJ7NT] rtm_read: got rtm of type 1 (RTM_ADD) addrs {DST,GATEWAY,NETMASK}
2021/08/05 14:41:24 ZEBRA: [TS3SH-1276M] default(0:0):10.10.40.0/24 update_from_ctx(): no fib nhg
2021/08/05 14:41:24 ZEBRA: [HKQXC-4STSK] default(0:0):10.10.40.0/24 update_from_ctx(): rib nhg matched, changed 'true'
2021/08/05 14:41:24 ZEBRA: [HBZNK-5H1X0] (0:0):10.10.40.0/24: Redist update re 0x8021cbe60 (static), old 0x0 (None)
2021/08/05 14:42:06 ZEBRA: [ZJ4AV-JEMJ3] dplane_intf_addr_set
2021/08/05 14:42:06 ZEBRA: [ZPR30-5G1FB] Kernel: Len: 164 Type: RTM_NEWADDR
2021/08/05 14:42:06 ZEBRA: [V3NSB-BPKBD] Kernel:
2021/08/05 14:42:06 ZEBRA: [HDTM1-ENZNM] Kernel: message seq 4664
2021/08/05 14:42:06 ZEBRA: [MJD4M-0AAAR] Kernel: pid 0, rtm_addrs {DST}
2021/08/05 14:42:06 ZEBRA: [M09CX-TKB4N] ifam_read_mesg: ifindex 1, ifname vtnet0, ifam_addrs {NETMASK,IFP,IFA,BRD}, ifam_flags 0x0, addr 10.10.40.3/24 broad 10.10.40.255 dst (unspec) gateway (unspec)
2021/08/05 14:42:06 ZEBRA: [MFYWV-KH3MC] rib_add_multipath_nhe: (0:0):10.10.40.0/24: Inserting route rn 0x802022f30, re 0x80308c4c0 (connected) existing 0x0, same_count 0
2021/08/05 14:42:06 ZEBRA: [MFYWV-KH3MC] rib_add_multipath_nhe: (0:?):10.10.40.0/24 (MRIB): Inserting route rn 0x802023160, re 0x80308c460 (connected) existing 0x0, same_count 0
2021/08/05 14:42:06 ZEBRA: [ZPR30-5G1FB] Kernel: Len: 240 Type: RTM_ADD
2021/08/05 14:42:06 ZEBRA: [V3NSB-BPKBD] Kernel: UP PINNED
2021/08/05 14:42:06 ZEBRA: [HDTM1-ENZNM] Kernel: message seq 0
2021/08/05 14:42:06 ZEBRA: [MJD4M-0AAAR] Kernel: pid 0, rtm_addrs {DST,GATEWAY,NETMASK}
2021/08/05 14:42:06 ZEBRA: [RG9Y6-E93A0] default(0:0):10.10.40.0/24: Updating route rn 0x802022f30, re 0x80308c4c0 (connected) old 0x8021cbe60 (static)
2021/08/05 14:42:06 ZEBRA: [RT9DY-ZS2KN] default(0:0):10.10.40.0/24: Adding route rn 0x802023160, re 0x80308c460 (connected)
2021/08/05 14:42:06 ZEBRA: [THSYN-E2XFY][EC 100663299] rtm_write: write : Address already in use (48)
2021/08/05 14:42:06 ZEBRA: [RV5F2-MQGZG][EC 100663303] kernel_rtm: 10.10.40.0/24: rtm_write() unexpectedly returned -5 for command RTM_DELETE
2021/08/05 14:42:06 ZEBRA: [ZPR30-5G1FB] Kernel: Len: 200 Type: RTM_DELETE
2021/08/05 14:42:06 ZEBRA: [V3NSB-BPKBD] Kernel: UP PROTO1
2021/08/05 14:42:06 ZEBRA: [HDTM1-ENZNM] Kernel: message seq 1
2021/08/05 14:42:06 ZEBRA: [MJD4M-0AAAR] Kernel: pid 60818, rtm_addrs {DST,GATEWAY,NETMASK}
2021/08/05 14:42:06 ZEBRA: [XASXT-GF69Y] kernel_rtm: No useful nexthops were found in RIB prefix 10.10.40.0/24
2021/08/05 14:42:06 ZEBRA: [TS3SH-1276M] default(0:0):10.10.40.0/24 update_from_ctx(): no fib nhg
2021/08/05 14:42:06 ZEBRA: [HKQXC-4STSK] default(0:0):10.10.40.0/24 update_from_ctx(): rib nhg matched, changed 'false'
2021/08/05 14:42:06 ZEBRA: [HBZNK-5H1X0] (0:0):10.10.40.0/24: Redist update re 0x80308c4c0 (connected), old 0x8021cbe60 (static)

netstat -rn:

10.10.40.0/24      link#1             U        vtnet0
10.10.40.3         link#1             UHS         lo0

show ip route:
C>* 10.10.40.0/24 [0/1] is directly connected, vtnet0, 00:18:48
S   10.10.40.0/24 [1/0] via 9.8.6.7, vtnet0, weight 1, 00:19:30

Signed-off-by: Donald Sharp <sharpd@nvidia.com>