make pubsub test fast
make control command tests fast
make list command tests fast
make object command tests fast
make list command tests even faster
speed up JedisSentinelTest
make JedisTest fast
make JedisSentinelPool fast
Merge pull request #490 from xetorthio/speedup_tests

Speedup tests
now ShardJedis can take optional parameters for h/s/z scan commands

* Since shard algorithm is based on key, it does make sense
* added unit test