Why I did it
Upgrade FRR to version 8.2.2. Build libyang2 required by FRR.
How I did it
Update FRR version and tag.
How to verify it
Following tests were performed on sonic-vs:
BGP docker status check
BGP configuration and session establishment
Route redistribution and ping
Issued show commands to check the bgp neighbor and routes
Checked app-db to ensure bgp routes are installed with correct interface and nexthop.
Create VRF and check FRR knows the VRF
Check VRF routes are installed in app-db with correct Vrf name and next-hop
Establish BGP Evpn session and check if Evpn routes (multicast, mac, prefix) are exchanged and installed correctly in app-db.
