SLING-2881 JcrResourceBundleProvider clears the cache on mix:language changes

- Apply patch by Tobias Bocanegra (thanks alot).
- Completely disabled the integration test due to unavailability
   of the pax test support (as well as the launchpad snapshot reference)
- Updated requirement to Java 6 due to use of Collections.newSetFromMap

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1560925 13f79535-47bb-0310-9956-ffa450edef68