test: use port 0 instead of common.PORT
Checklist
-
make -j8 test
(UNIX), orvcbuild test nosign
(Windows) passes -
commit message follows commit guidelines
Affected core subsystem(s)
test
Description of change
Use port 0 instead of common.PORT.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data