bgpd: add bgp ipv6-auto-ra command (backport #16354)#17265
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Introduce a command to stop bgpd from enabling IPv6 router advertisement messages sending on interfaces. Signed-off-by: Mikhail Sokolovskiy <sokolmish@gmail.com> (cherry picked from commit 7b1c0c2)
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Introduce a command to completely disable sending IPv6 router advertisement messages on an interface. Before, there were cases where it could be enabled by other daemons, namely bgpd and vrrpd. Particularly, it happens when BGP extended-nexthop capability is used: bgpd tells zebra to enable RA in this case, though it wasn't intended.
Fixes #7738.
This is an automatic backport of pull request #16354 done by [Mergify](https://mergify.com).