bgpd: Send End-of-RIB not only if Graceful Restart capability is received

bgpd: Send End-of-RIB not only if Graceful Restart capability is received

Before we checked for received Graceful Restart capability, but that was also
incorrect, because we SHOULD HAVE checked it per AFI/SAFI instead.

https://datatracker.ietf.org/doc/html/rfc4724 says:

Although the End-of-RIB marker is specified for the purpose of BGP
   graceful restart, it is noted that the generation of such a marker
   upon completion of the initial update would be useful for routing
   convergence in general, and thus the practice is recommended.

Thus, it might be reasonable to send EoR regardless of whether the Graceful Restart
capability is received or not from the peer.

Signed-off-by: Donatas Abraitis <donatas@opensourcerouting.org>