WIP: test shows a bug in 3.25

IKEv2 with two connections, one to receive on a specific port and one to
send to another host on that same specific port, eg:

conn one
	also=base
	leftprotoport=udp/6081
	rightprotoport=udp

conn two
	also=base
	leftprotoport=udp
	rightprotoport=udp/6081

then try and bring both conns up

TODO: confirm conns with traffic on those ports