Sentinel support

[ChrisCurtin]

Looking for feedback before adding tests.

I need Sentinel support and looking at the existing pool, it looks like changing to Pool and adding a constructor would allow the filters to be used in Sentinel instances.

I also added a constructor that includes an externally provide pool for integration with other users of Redis so we don't have too many open connections.

Ideas/looking for feedback

• should I build a RedisPoolConfiguration class similar to the RedisSentinelConfiguration for consistency?
• I see a pull request for SSL support. if I add RedisSentinelConfiguration I think it would make sense to add all new pool configuration settings to it, instead of expanding the set of Constructors.
• what does the startThread logic do? I couldn't find any tests or where it is used. If needed, can you explain more about why you're creating an explicit Jedis instead of using a resource from the pool?
• I've looked at Redis Cluster in Jedis enough to see I can't do the Pool change and have it work with Cluster too. Are you guys working on a refactoring that would work with any connection source?

Thanks

Chris

[Jaskey]

which version support sentinel? I come from the start up and use 1.0.7 and find it is not supported yet