Fixed tests failures

git-svn-id: https://svn.wso2.org/repos/wso2/carbon/platform/trunk@180874 a5903396-d722-0410-b921-86c7d4935375
Validate domain name, not to contain underscore

git-svn-id: https://svn.wso2.org/repos/wso2/carbon/platform/trunk@180875 a5903396-d722-0410-b921-86c7d4935375