BGP Confederation support in antctl

[rajnkamr]

Describe what you are trying to solve

• Add confederation identifier in antctl get bgppolicy

• Add new command for bgp confederations member ASNs antctl get bgpconfederations

Describe the solution you have in mind

$ antctl get bgppolicy

NAME                              ROUTER-ID    LOCAL-ASN   LISTEN-PORT    CONFEDERATION-IDENTIFIER
example-bgp-policy                172.18.0.2   64512       179            65000

If BGP Confederation is not configured, then confederation identifier can be 0 or NONE.

$ antctl get bgppolicy

NAME                             ROUTER-ID         LOCAL-ASN    LISTEN-PORT    CONFEDERATION-IDENTIFIER
example-bgp-policy               172.18.0.2        64512        179            <NONE>

$ antctl get bgpconfederationmembers

MEMBER-ASN
64513
64514

Should MEMBER-ASN include LOCAL-ASN 64512 as well ? because 64512 is also a member of the confederation 65000. Assuming that a bgp policy is applied with local asn 64512, bgp confederation identifier 65000 and member asn 64513 and 64514.

Describe how your solution impacts user flows

N/A
Describe the main design/architecture of your solution

N/A
Alternative solutions that you considered

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Test plan

N/A
Additional context

[Atish-iaf]

cc @antoninbas @hongliangl