SLING-2788 - move sling-pax-util under testing

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1560937 13f79535-47bb-0310-9956-ffa450edef68
SLING-2788 - move sling-pax-util under testing

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1560938 13f79535-47bb-0310-9956-ffa450edef68