[frrcfgd] Add support for v6only option for unnumbered BGP peers #14955
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Why I did it
This option is useful to force FRR to use unnumbered BGP peering despite an IPv4 address being configured on the interface.
How I did it
Added the option to the Jinja2 template and frrcfgd.
How to verify it
192.0.2.1/31
)192.0.2.0
)v6only
option for this peerWhich release branch to backport (provide reason below if selected)
None (it's a feature)
Tested branch (Please provide the tested image version)
Description for the changelog
Add support for v6only option for unnumbered BGP peers
Link to config_db schema for YANG module changes
A picture of a cute animal (not mandatory but encouraged)