run rebalance suite when multiple hosts specified

ie: ./pyupr -h 127.0.0.1:9000  127.0.0.1:9001 127.0.0.1:9002 127.0.0.1:9003 -b dev
the rebalance tests will run after unit tests and mcd tests

Change-Id: I32499d2ed08d3fd23d8218334e3779915fb5d64a
Merge "run rebalance suite when multiple hosts specified"