bgpd: Allow bgp static routes to use /32's

bgpd: Allow bgp static routes to use /32's

If you are including a network statement of a /32
then the current bgp martian checks will match the /32
together.

Problem:
!
router bgp 3235
 neighbor 192.168.161.2 remote-as external
 neighbor 192.168.161.131 remote-as external
 !
 address-family ipv4 unicast
  network 10.10.3.11/32
  network 192.168.161.0/24
  no neighbor 192.168.161.2 activate
  neighbor 192.168.161.2 route-map BLUE in
 exit-address-family
!
eva# show bgp ipv4 uni
BGP table version is 1, local router ID is 10.10.3.11, vrf id 0
Default local pref 100, local AS 3235
Status codes:  s suppressed, d damped, h history, * valid, > best, = multipath,
               i internal, r RIB-failure, S Stale, R Removed
Nexthop codes: @NNN nexthop's vrf id, < announce-nh-self
Origin codes:  i - IGP, e - EGP, ? - incomplete
   Network          Next Hop            Metric LocPrf Weight Path
   10.10.3.11/32    0.0.0.0(eva)             0         32768 i
*> 192.168.161.0/24 0.0.0.0(eva)             0         32768 i
Displayed  2 routes and 2 total paths
eva# show bgp import-check-table
Current BGP import check cache:
 192.168.161.0 valid [IGP metric 0], #paths 1
  if enp39s0
  Last update: Fri Sep 25 08:00:42 2020
 10.10.3.11 valid [IGP metric 0], #paths 1
  if lo
  Last update: Fri Sep 25 08:00:42 2020
eva# show bgp ipv4 uni summ
BGP router identifier 10.10.3.11, local AS number 3235 vrf-id 0
BGP table version 1
RIB entries 3, using 576 bytes of memory
Peers 1, using 21 KiB of memory
Neighbor                 V         AS   MsgRcvd   MsgSent   TblVer  InQ OutQ  Up/Down State/PfxRcd   PfxSnt
janelle(192.168.161.131) 4      60000        69        70        0    0    0 00:03:21            0        1
Total number of neighbors 1

When we are deciding that a nexthop is valid there is not much point in checking
that a static route has a martian nexthop or not, since we self derived it already.

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