Add protection in RaXmlDeployer to prevent from loading xml resource

If we place a -ra.xml in jar file, the class RaXmlDeployer will fail with "URI not hierarchical error", because it doesn't handle jar file.
The goal of this issue is prevent for loading jar file in RaXmlDeployer .
The second goal is to provide ability of overring RaXmlDeployer in custom deployer who extends this class.