net vxlan: don't learn non-unicast L2 destinations (#3192)
See Gluon #3191 Link: https://github.com/freifunk-gluon/gluon/issues/3191 Signed-off-by:David Bauer <mail@david-bauer.net>
See Gluon #3191 Link: https://github.com/freifunk-gluon/gluon/issues/3191 Signed-off-by:David Bauer <mail@david-bauer.net>