Add ability to set nodeId for VisorIdleVerifyDumpTask executed from ./control.sh --host HOST --cache idle_verify

--cache idle_verify sets null nodeId on invocation of 

private <R> R executeTaskByNameOnNode(GridClient client, String taskClsName, Object taskArgs, UUID nodeId
) throws GridClientException {

Which causes reduce phase to be assigned on random node, we want to dump results on particular node.