Adding a separate proxy service for policy 11.

git-svn-id: https://svn.wso2.org/repos/wso2/carbon/platform/trunk@180465 a5903396-d722-0410-b921-86c7d4935375
API for retrieving subscriptions under an Application.

git-svn-id: https://svn.wso2.org/repos/wso2/carbon/platform/trunk@180466 a5903396-d722-0410-b921-86c7d4935375