@Override
		public String toString() {
			return "ModuleRuntimeContainers{" +
					"sourceContainers=" + sourceContainers +
					", sinkContainers=" + sinkContainers +
					", processorContainers=" + processorContainers +
					'}';
		}
Return true if a source and sink container have been
populated.

@return true if source and sink containers have been populated
spring-xd-distributed-test/src/test/java/org/springframework/xd/distributed/test/AbstractDistributedTests.java