Support for `redis://` URIs

[pratul]

If I provide a redis:// style URI, I get an exception in RedisModeURIFactory#build. I've gone through the library source and it appears that such a URI scheme isn't supported out of the box -- even though Lettuce supports it.

However, I also cannot figure out how to pass the values from a deconstructed redis:// URI to the bundle during the Dropwizard initialization step. Any pointers?

[natalie-zamani]

Hey Pratul! Thanks for the issue. Without an error trace, this likely seems related to our usage of the Guava HostAndPort class, and seems like it might be a good motivator to move away from that class.