bgpd: Display received and advertised EVPN routes from neighbors

bgpd: Display received and advertised EVPN routes from neighbors

"show bgp l2vpn evpn neighbors <neighbor> [advertised-routes|routes]' did
not work due to various bugs. First, the command only accepted IPv4
addresses as valid neighbor ID, thereby rejecting unnumbered BGP and IPv6
neighbor address. Second, the SAFI was hardcoded to MPLS_VPN even though
we were passing the safi. Third, "all" made no sense in the command context
and to make the command uniform across all address families, I removed the
"all" keyword from the command.

Signed-off-by: Dinesh G Dutt <ddps4u@gmail.com>