Clean up JedisSentinelTestUtil

* remove all unused methods
* move JedisSentinelPoolTest.waitForJedisSentinelPoolRecognizeNewMaster to JedisSentinelTestUtil
** both JedisSentinelTest and JedisSentinelPoolTest can use this implementation
* introduce FailoverAbortedException
** throws when we subscribe sentinel channels and got message by "-failover-abort-*" channel
* respect Source Format to Java Convention (by Eclipse -> Source -> Format)
Revert "Clean up JedisSentinelTestUtil"

This reverts commit a3862bc2dd96805b85d2a99ed03e5d76c615e1d9.