Added test for checking cluster scalability

Change-Id: I892deb9dbd90ad04e1a7350641e0a392a20f04a9
Closes-Bug: #1310626
(cherry picked from commit 1a2f36a9efc0c43d5a0266791c6cadc663be3f5d)
Merge "Added test for checking cluster scalability" into stable/5.0