ospfd: VRF aware Router-ID update

ospfd: VRF aware Router-ID update

Ensure zebra received router-id isolated per vrf instance.
Store zebra received router-id within ospf instance.

Ticket:CM-18657
Reviewed By:
Testing Done:
Validated follwoing sequence
- Create vrf1111
- Create ospf vrf1111 with no router-id
- Assign ip to vrf111
- ospf is assigned zebra assigned router-id which is vrf ip.
- upon remvoing vrf ip, the router-id retained as same until
ospfd restarted.

Signed-off-by: Chirag Shah <chirag@cumulusnetworks.com>