Fixing Unknown event listener error. Updating subscription logic for Multitenant cartridges
adding a check to undeploy service if only a if only no active Subscriptions are found
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/incubator-stratos into lb_subscription_refactoring
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/incubator-stratos