ISPN-4409 Upgrade to LevelDB 0.7 and fix server test assertions

* Upgrade to LevelDB 0.7 in order to align with server's Guava
version which currently is 16.x.
* Fixed LevelDB server test assertions to avoid having to instantiate
the cache's marshaller client side.
ISPN-4012 Mark mass indexing tests as unstable
ISPN-4012 Mark mass indexing tests as unstable
Temporarily disable REST security integration tests until  ISPN-4407
ISPN-4412 Fix failing embedded security integration tests
ISPN-4415 Provide correct Managed executor facade and fix XSLT

* Correct executor thread factories needed to be provided according
to the executor being plugged. Scheduled ones need a different facade.
* Fix an XSLT issue so that custom Hot Rod endpoints are added
correctly.