Use released Sling API 2.7.0

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1580833 13f79535-47bb-0310-9956-ffa450edef68
Use released Sling API 2.7.0

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1580834 13f79535-47bb-0310-9956-ffa450edef68
Use released Sling API 2.7.0

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1580835 13f79535-47bb-0310-9956-ffa450edef68