Extend eoiu support to speed up route reconciliation of EVPN/fdbsyncd

[nkelapur]

What I did

Extend bgp eoiu support to speed up route reconciliation of EVPN/fdbsyncd

Why I did it

To make use of eoiu feature to speed up reconciliation of EVPN/fdbsyncd

How I verified it

Tested with warm-reboot with EVPN, IPV6 and IPv4 AF BGP peers setup

Details if related

more details in issue https://github.com/Azure/sonic-swss/issues/1657

[anshuv-mfst]

@prsunny - can you please review, thanks.