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

VltSerializationManager: added basic mechanism to get a resource path
from a serialized file path.

git-svn-id: https://svn.apache.org/repos/asf/sling/branches/tooling-ide-vlt@1522844 13f79535-47bb-0310-9956-ffa450edef68