ISPN-4569 Inserting into cache with indexing fails for XA transactions

* Use the BatchModeTransactionManager for the cluster registry cache.
* Suspend ongoing transactions during cluster registry cache operations,
  in case another cache also uses the same TM.
ISPN-4436 Karaf is stucked when running iOSGI integration tests
ISPN-4601 DirectoryLoaderAdaptor computes the auto-chunk factor applying wrong rounding
ISPN-4436 Karaf stucked when running iOSGI integration tests on IBM JDK

Upgrade the PAX EXAM version in the server integration module also.
Fix LargeClusterStressTest to create clustered caches and check the data
perf testing hacks