rgw doesn't respond `livenessProbe` if the number of connection reaches its
limit (by default, 1000). Then rgw is out of service but still live.
Hense the current `livenessProbe` logic is suitiable for `readinessProbe`.
`tcpSocket` is enough for `livenessProbe`.
Closes: #8407
Signed-off-by: Yuzuki Mimura <yuzuki725.m@gmail.com>
Signed-off-by: Satoru Takeuchi <satoru.takeuchi@gmail.com>