adding test util class

git-svn-id: https://svn.wso2.org/repos/wso2/carbon/platform/trunk@179831 a5903396-d722-0410-b921-86c7d4935375
fixing test clenup issue for user roles with non admin user

git-svn-id: https://svn.wso2.org/repos/wso2/carbon/platform/trunk@179832 a5903396-d722-0410-b921-86c7d4935375