Add Multi-instance support for redis storage

[Avinash-Kamath]

Support for using same redis space when running multiple servers.

When running multiple app servers for the same app, all the servers are connected same DB. So it make sense to add use common cache.

Example: If there are 2 items in the list for instance A and 2 items in list for instance B. If one item gets deleted. Cache should be invalidated for both instances.