Added getUri api to RedisConnection

Hello @x-ma, 

Added this api to just RedisConnection to keep things simple, will extend
it to other types if required.

Please review the following commits I made in branch 'satya-connection-drops'.

c9224fc4c4b1b5b5b9b5f1d160486b9c5769b963 (2014-03-10 13:03:39 -0700)
Added getUri api to RedisConnection

R=@x-ma