Notify source port test is not reliable

The notify messages are being sent from ns2 to ns3 which means they require retry code to kick in before the test is made.

I:notify:checking notify-source uses port option correctly (11)
I:notify:failed

ns2:

08-Feb-2023 23:40:59.446 dispatchmgr 0x7b2400000000: dispatch_createudp: created UDP dispatch 0x7b5000061600 for 10.53.0.2#12305
08-Feb-2023 23:41:24.202 dispatchmgr 0x7b2400000000: dispatch_createudp: created UDP dispatch 0x7b5000040e00 for 10.53.0.2#12305

ns3:

08-Feb-2023 23:40:59.526 starting BIND 9.19.11-dev (Development Release) <id:bfc70be>
08-Feb-2023 23:41:24.202 client @0x7b780004f800 10.53.0.2#12305: received notify for zone 'x1': not authoritative