CommandAwareRpcDispatcher swallows thread interruptions

When interruption happens in FutureCollator.getResponseList() method

see
https://github.com/infinispan/infinispan/blob/5.1.x/core/src/main/java/org/infinispan/remoting/transport/jgroups/CommandAwareRpcDispatcher.java#L410

it is ignored and later wrongly dealt with as TimeoutException
(The original exception is not even set as cause anywhere)

This disables possibility of interrupting some cache operations.