ISPN-4881 OptimisticLockingTxClusterExtendedStatisticLogicTest.createBef...

...oreClass fails on JDK8

* Set @Start priority higher than LockManager and RpcManager

https://issues.jboss.org/browse/ISPN-4881
@pruivo I think it's worth mentioning DeadlockDetectingLockManager explicitly