Change from update,stop,start  to stop,update,start.

Warning, XXX: Benjamin Hack to perform fast scalability test base

Warning, XXX: Benjamin Hack to perform fast scalability test base

In order to be able to fix the configuration consistency directly from this method.

Add 'cluster' word into the dict.
-> {'cluster':{xxx}, yyy}

Add test_suite to the option given to the instance XML configuration.

Add command line options to performance_tester in order to enable
searching of userInfo and benchmark test files in specified paths.