BUG 2090 : Clustering : Bring akka-raft unit test coverage upto 80%

Change-Id: I7b2b16aa42b655e924942f356602c64ccf6d86b7
Signed-off-by: Moiz Raja <moizr@dhcp-10-154-140-127.cisco.com>
Merge "BUG 2090 : Clustering : Bring akka-raft unit test coverage upto 80%" into stable/helium