Align the hazelcast cluster names

Align the hazelcast cluster names

- We need to align the hazelcast cluster names as members of the same
  cluster can join each other. We will still have exclusivity as the
  instance names and configs are different for each distributed object.
- Exposing env variable to override the cluster name depending on the
  env it is run on.
- Modified test cases to validate the cluster names as well

Issue-ID: CPS-1637
Change-Id: Ib0f8c80dc9b2268f976b0c2d3ccd6d64792d4781
Signed-off-by: mpriyank <priyank.maheshwari@est.tech>