Change to unit test for Phpass\Adapter\Base
Change to unit test for Phpass\Adapter\Base

Updated the unit test to disable preservation of the global state while
running the factory tests. Hopefully the test will reveal issues like
the one fixed in 55464b393f3482e4607a8c40b78123e310cb4442 going forward.
rchouinard/phpass,cymapgt/phpass,coreymcmahon/phpass