ISPN-2875 Intermittent test failure: org.infinispan.statetransfer.DistNonTxOperationsDuringStateTransferTest

Delaying execution of Transport.invokeRemotely(CacheTopologyControlCommand) on coordinator is usually enough to delay the start of rebalance on the joiner in most cases but not in the rare case when the joiner receives a non-null pending CH right in the initial topology returned to it from the join call. This was causing the assert to fail. A more manageable way of delaying start of rebalance is to override the RebalancePolicy rather than the Transport. This approach ensures (at least in this test scenario) that the initial topology has a null pending CH.

Integrate in master please.

JIRA: https://issues.jboss.org/browse/ISPN-2875