@AfterClass
	public static void afterClass() throws InterruptedException {
		if (!suiteDetected) {
			distributedTestSupport.shutdownAll();
		}
	}
After all tests are executed, {@link DistributedTestSupport#shutdownAll}
is invoked if an instance was not provided by the test suite
{@link DistributedTestSuite}.
spring-xd-distributed-test/src/test/java/org/springframework/xd/distributed/test/AbstractDistributedTests.java