adding updated SQL schema of rss manager

git-svn-id: https://svn.wso2.org/repos/wso2/carbon/platform/trunk@178597 a5903396-d722-0410-b921-86c7d4935375
modifying h2 dbscript path

git-svn-id: https://svn.wso2.org/repos/wso2/carbon/platform/trunk@178598 a5903396-d722-0410-b921-86c7d4935375
Fixing https://wso2.org/jira/browse/APIMANAGER-1400

git-svn-id: https://svn.wso2.org/repos/wso2/carbon/platform/trunk@178600 a5903396-d722-0410-b921-86c7d4935375