SLING-2989 - [Tooling] integrate with vlt once available

The SerializationManager now returns a ResourceProxy instead of a Map
containing the properties. This helps with assigning the correct
repository path and prepares the way in returning all the resources
covered in a docview xml file.

git-svn-id: https://svn.apache.org/repos/asf/sling/branches/tooling-ide-vlt@1523331 13f79535-47bb-0310-9956-ffa450edef68
SLING-2989 - [Tooling] integrate with vlt once available

Enabled property sync for full coverage aggregates, but only for the
top-level node.

git-svn-id: https://svn.apache.org/repos/asf/sling/branches/tooling-ide-vlt@1523332 13f79535-47bb-0310-9956-ffa450edef68