[FELIX-4190] The framework should not hold any lock while calling ServiceFactory#unget

This commit should be quite safe as getUsingBundles() and ungetService() are already thread safe, and there's no possibility for the bundle to acquire a new reference to the service because the service has already been unregistered

git-svn-id: https://svn.apache.org/repos/asf/felix/trunk@1509692 13f79535-47bb-0310-9956-ffa450edef68
Use released versions

git-svn-id: https://svn.apache.org/repos/asf/felix/trunk@1509721 13f79535-47bb-0310-9956-ffa450edef68