Speed up Sentinel related tests

* remove FIXME sleep codes for Sentinel related tests
** add functions for Sentinel tests (JedisSentinelTestUtil)
*** waitForSentinelRecognizeRedisReplication
*** waitForNewPromotedMaster
*** waitForSentinelsRecognizeEachOthers
**** TODO: there're no command for sentinel to list recognized sentinel
**** sleep 5.5 sec (sentinel pings to master every 5 sec)

* set HostAndPort class to public(no longer inner) class
** reason: We cannot know pool's current master if HostAndPort class is
private inner class / HostAndPort classes are duplicated (main/test)
** make getter method and parameterized constructor
*** set fields once, get anytime
upgrade dependencies in gradle build file (to match the ones in pom.xml) and update version of gradle wrapper
Merge pull request #474 from 50onRed/upgrade-dependencies

update gradle build file
upgrade to commons-pool 2
Merge branch 'speed-up-unit-test' of github.com:HeartSaVioR/jedis into upgrade_libs

Conflicts:
	src/test/java/redis/clients/jedis/tests/JedisPoolTest.java
	src/test/java/redis/clients/jedis/tests/JedisSentinelPoolTest.java
	src/test/java/redis/clients/jedis/tests/JedisSentinelTest.java
	src/test/java/redis/clients/jedis/tests/ShardedJedisPipelineTest.java
	src/test/java/redis/clients/jedis/tests/ShardedJedisPoolTest.java
	src/test/java/redis/clients/jedis/tests/benchmark/PoolBenchmark.java
	src/test/java/redis/clients/jedis/tests/commands/TransactionCommandsTest.java
Merge branch 'master' of github.com:xetorthio/jedis
Updated maven dependency template Jedis version to  2.2.1 (latest)
Merge pull request #484 from mathieuboniface/patch-1

Updated maven dependency template Jedis version to  2.2.1 (latest)
Update Gradle build to use Apache Commons Pool 2.0.
Merge pull request #485 from tague/479_gradle_build_file_fix

Update Gradle build to use Apache Commons Pool 2.0.
make jedis unit tests pass to Redis 2.8.1

* increase sentinel instance to test JedisSentinelTest
** clear() called, slave promoted to master (slave of no one), New
Sentinel force to restore it (demote) -> slave is not reusable
* ipv6 applied at Redis 2.8 -> localhost / 127.0.0.1 / ::1 is now all same

* Makefile: sleep some time for launch each sentinel (workaround to sentinel's issue)
** issue to sentinel leader vote: https://github.com/antirez/redis/issues/1419
*** sentinel may confused to vote with sentinels launched approximately same time