protected void verifyStreamDeployed(String streamName) throws InterruptedException {
		verifyStreamState(streamName, DeploymentUnitStatus.State.deployed);
	}
Block the executing thread until either the stream state is
{@link DeploymentUnitStatus.State#deployed} or 30 seconds
have elapsed.

@param streamName name of stream to verify
@throws InterruptedException
spring-xd-distributed-test/src/test/java/org/springframework/xd/distributed/test/AbstractDistributedTests.java