ISPN-3299 ReplTotalOrderStateTransferFunctional1PcTest.testSTWithThirdWritingTxCache random failures

https://issues.jboss.org/browse/ISPN-3299

A little mismatch, the code as assuming that the SEQUENCER is there. That was not true and an unordered deliver was blocking everything. 

for 5.3.x branch: https://github.com/pruivo/infinispan/tree/ISPN-3299-5.3.x