ISPN-4989 infinispan-transport thread name is undefined
ISPN-4974 Cross site state transfer - CLI ops throw NPE when backup is not defined

* check if XSiteAdminOperations is registered before trying to execute the operation
ISPN-4273 Add server integration tests for JGroups SASL auth
Remove unused imports
Make some non-API classes final
Replace deprecated usages of Lucene version constants (Version.LUCENE_4_10_1 -> Version.LATEST)
ISPN-5004 Enhance ProtobufMetadataManagerMBean

* Move ProtobufMetadataManagerMBean to infinispan-remote-query-client module, unfortunatelly could not
  keep the same package so a deprecated copy of ProtobufMetadataManagerMBean exists in previous location
  too for backward compatibility

* Rename method: displayProtofile( ) --> getProtofile( )

* Add methods getProtofileNames, getProtofile, getFilesWithErrors, getFileErrors