bgpd: add missing type-1 and type-4 route descriptions to the legend

bgpd: add missing type-1 and type-4 route descriptions to the legend

Sample output -
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root@torm-11:mgmt:~# net show bgp l2vpn evpn route rd 27.0.0.16:3
EVPN type-1 prefix: [1]:[ESI]:[EthTag]:[IPlen]:[VTEP-IP]
EVPN type-2 prefix: [2]:[EthTag]:[MAClen]:[MAC]
EVPN type-3 prefix: [3]:[EthTag]:[IPlen]:[OrigIP]
EVPN type-4 prefix: [4]:[ESI]:[IPlen]:[OrigIP]
EVPN type-5 prefix: [5]:[EthTag]:[IPlen]:[IP]

BGP routing table entry for 27.0.0.16:3:[1]:[0]:[03:44:38:39:ff:ff:01:00:00:01]:[32]:[0.0.0.0]
Paths: (4 available, best #2)
  Advertised to non peer-group peers:
  spine-1(swp1) spine-1(swp2) spine-2(swp3) spine-2(swp4)
  4435 5551
    27.0.0.16 from spine-1(swp2) (27.0.0.13)
      Origin IGP, valid, external
      Extended Community: RT:5551:1009 ET:8
      Last update: Thu Sep  3 21:01:53 2020
  4435 5551
    27.0.0.16 from spine-1(swp1) (27.0.0.13)
      Origin IGP, valid, external, bestpath-from-AS 4435, best (Router ID)
      Extended Community: RT:5551:1009 ET:8
      Last update: Thu Sep  3 21:01:53 2020
  4435 5551
    27.0.0.16 from spine-2(swp3) (27.0.0.14)
      Origin IGP, valid, external
      Extended Community: RT:5551:1009 ET:8
      Last update: Thu Sep  3 21:01:53 2020
  4435 5551
    27.0.0.16 from spine-2(swp4) (27.0.0.14)
      Origin IGP, valid, external
      Extended Community: RT:5551:1009 ET:8
      Last update: Thu Sep  3 21:01:53 2020

Signed-off-by: Anuradha Karuppiah <anuradhak@cumulusnetworks.com>
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