Reverting part of [6554] - It is semantically incorrect (even for tests, since...

Reverting part of [6554] - It is semantically incorrect (even for tests, since it affects core code), to duplicate the Token hash logic which can be changed by plugins. The code to hash is in Piwik_Login.getHashTokenAuth

git-svn-id: http://dev.piwik.org/svn/trunk@6572 59fd770c-687e-43c8-a1e3-f5a4ff64c105