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.
ISPN-2956 Hot Rod conditional operations and transactional caches

* Transactional caches are required in order to be able to guarantee
correct retry logic for Hot Rod operations relying on conditional
operations, or operations where the previous value is returned.
* WARN messages have been added for when conditional or operations
needing previous value are executed against non-transactional caches.