Allow network with --config-from to be --internal
Allow network with --config-from to be --internal

The --internal netlabel is discarded now.

Signed-off-by: Pavel Matěja <2375fa63e2908bb2df59f606483a3aa92321db7a@verotel.cz>

mahak/libnetwork,mahak/libnetwork,docker/libnetwork,docker/libnetwork,mahak/libnetwork,docker/libnetwork