Fix for flaky TestFleetRecreateGameServers (#2535)
Fix for flaky TestFleetRecreateGameServers (#2535)

If the returned packet gets dropped somewhere, we can confirm if it's
still a valid test, as if the `GameServer` is gone, we're in a good
place.

Closes #2479

Co-authored-by: Robert Bailey <05f8136017a996ef827d97d0245185da0eee883a@google.com>
googleforgames/agones,googleforgames/agones,googleforgames/agones,googleforgames/agones,googleforgames/agones,googleforgames/agones,googleforgames/agones,googleforgames/agones