Subnet route has a path from local peer which is discard. Flow are marked
discard for same.
It can also have paths from BGP peer for handling arp floods which can point to
composite NH containing EVPN peers. This path need not inherity local peer path
property i.e. flow will not be marked as discard.

Change-Id: Id58b13be1796fa3889bf4f795cc1e908cedc231d
Merge "Subnet route has a path from local peer which is discard. Flow are marked discard for same. It can also have paths from BGP peer for handling arp floods which can point to composite NH containing EVPN peers. This path need not inherity local peer path property i.e. flow will not be marked as discard."