RR client support in minigraph for FRR

[nikos-github]

Changing minigraph.py to add RR client support that's needed for FRR.

Unit tested on my testbed (see below output).

Regards,

Nikos.-

router bgp 11
bgp router-id 11.11.11.11
bgp log-neighbor-changes
no bgp default ipv4-unicast
bgp bestpath as-path multipath-relax
neighbor 10.1.1.1 remote-as 10
neighbor 10.1.1.1 description CSW01
neighbor 10.2.1.1 remote-as 20
neighbor 10.2.1.1 description CSW02
neighbor 10.3.1.1 remote-as 30
neighbor 10.3.1.1 description CSW03
neighbor 10.4.1.1 remote-as 40
neighbor 10.4.1.1 description CSW04
neighbor 11.1.1.1 remote-as 111
neighbor 11.1.1.1 description IXIA
neighbor 111.111.111.111 remote-as 11
neighbor 111.111.111.111 description TEST
neighbor fc00:1:1::1 remote-as 10
neighbor fc00:1:1::1 description CSW01
neighbor fc00:2:1::1 remote-as 20
neighbor fc00:2:1::1 description CSW02
neighbor fc00:3:1::1 remote-as 30
neighbor fc00:3:1::1 description CSW03
neighbor fc00:4:1::1 remote-as 40
neighbor fc00:4:1::1 description CSW04
!
address-family ipv4 unicast
network 11.11.11.11/32
network 100.100.100.0/24
neighbor 10.1.1.1 activate
neighbor 10.2.1.1 activate
neighbor 10.3.1.1 activate
neighbor 10.4.1.1 activate
neighbor 11.1.1.1 activate
neighbor 111.111.111.111 activate
neighbor 111.111.111.111 route-reflector-client
maximum-paths 64
exit-address-family
!
address-family ipv6 unicast
network 2001:db8:bad:a55::/64
neighbor fc00:1:1::1 activate
neighbor fc00:2:1::1 activate
neighbor fc00:3:1::1 activate
neighbor fc00:4:1::1 activate
maximum-paths 64
exit-address-family

[msftclas]

@Nikos-Li,
Thanks for your contribution as a Microsoft full-time employee or intern. You do not need to sign a CLA.
Thanks,
Microsoft Pull Request Bot

[lguohan]

can you add this in the sample minigraph and add unit test as well, to make sure later no one will break this feature.

[nikos-github]

Ok let me do that and repost.

[lguohan]

still worth to add the sample configuration in the minigraph, so that later taoyu know how to move it to the config db.

[stcheng]

Please add sample minigraphs and corresponding unit test cases afterward.