handle IPv6 addresses with an explict incoming interface at the end (e.g...

handle IPv6 addresses with an explict incoming interface at the end (e.g fe80::ae2d:d1e7:fe1e:9a8d%enp2s0)

Signed-off-by: Konrad Bucheli <konrad.bucheli@gmx.ch>
Signed-off-by: Konrad Bucheli <kb@open.ch>