test: eliminate multicast test FreeBSD flakiness
test-dgram-multicast-multi-process was flaky on FreeBSD and Raspeberry Pi. This refactoring fixes the issue by eliminating a race condition.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
test-dgram-multicast-multi-process was flaky on FreeBSD and Raspeberry Pi. This refactoring fixes the issue by eliminating a race condition.