router: add dst mac check
router: add dst mac check

If CHECK_MAC_DST is defined, the router checks that the destination mac address is the same assigned to the port of the router. It also accepts broadcast and multicast addresses.

iovisor/iovisor-ovn,iovisor/iovisor-ovn,netgroup-polito/iovisor-ovn,netgroup-polito/iovisor-ovn