[WFLY-2723] reads of the serverInventory are not guarded by the serverInventoryLock
[WFLY-2791] remove jboss-marshalling dependency
[WFLY-2558] fix patching test assertion
remove unused patch-gen module
Merge pull request #5832 from emuckenhuber/misc

fixes for WFLY-2723, WFLY-2791 and WFLY-2558