Modifying Role creation UI test to make sure a POST is done at add-step2.jsp and not GET

git-svn-id: https://svn.wso2.org/repos/wso2/carbon/platform/trunk@172303 a5903396-d722-0410-b921-86c7d4935375
patch by lasantha 

git-svn-id: https://svn.wso2.org/repos/wso2/carbon/platform/trunk@172304 a5903396-d722-0410-b921-86c7d4935375