Labels added to mark roles of the Redis Pods as Master and slave

[SuhailRahman]

Fixes #275

Changes proposed on the PR:

• Labels were added to the Redis pods as master and slave depending on the roles, this would be helpful when any user would want to access Redis outside of the Kubernetes cluster. The users would have to expose the Redis pods with the label as role: Master and the exposed service would point to the Master Redis pod.

[SuhailRahman]

@ese please review this

[SuhailRahman]

@ese can you check this

[SuhailRahman]

closed this issue by mistake

[ese]

Thanks for the patience @SuhailRahman. Due the last updates in the client-go you need to add context parameter to the patch functions.

[ese]

closed by #419