SLING-3456 - moving contrib/extensions/replication into contrib/extensions/replication/core

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1578910 13f79535-47bb-0310-9956-ffa450edef68
SLING-3456 - moving contrib/extensions/replication into contrib/extensions/replication/core

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1578911 13f79535-47bb-0310-9956-ffa450edef68