if we could not get the l3 device in olsrd_write_interface then try to get the
	physical device instead. But only if the protocoll is "static" or "none".
	This is useful to write Interfaces in the resulting olsrd.conf file which
	are not up at the time olsrd is starting (e.g. tunnel interfaces):
Merge pull request #5 from mmunz/master

if we could not get the l3 device in olsrd_write_interface then try to g...