public String getContainerHostForSource(String streamName) {
        return getContainerHostForModulePrefix(streamName, ModuleType.source);
    }
Gets the host of the container where the source was deployed

@param streamName Used to find the container that contains the source.
@return The host that contains the source.
spring-xd-integration-test/src/main/java/org/springframework/xd/integration/fixtures/ContainerResolver.java