adding registry handler module

git-svn-id: https://svn.wso2.org/repos/wso2/carbon/platform/trunk@179389 a5903396-d722-0410-b921-86c7d4935375
adding tenant mgt module

git-svn-id: https://svn.wso2.org/repos/wso2/carbon/platform/trunk@179390 a5903396-d722-0410-b921-86c7d4935375
Fix for WSAS-1347. Thanks Piyum for the contribution

git-svn-id: https://svn.wso2.org/repos/wso2/carbon/platform/trunk@179391 a5903396-d722-0410-b921-86c7d4935375