Updated tests to remove deprecated code from tests

* cleanup removing unused headers
* Updated asserts in code base that needed messages (marked as deprecated)
* left one test that was testing a deprecated constructor.  When that code is removed we can remove that test.
* some other cleanup

resolves #338

spring-cloud-task-samples/taskprocessor/src/test/java/io/spring/TaskProcessorApplicationTests.java

@@ -35,7 +35,6 @@ import org.springframework.test.context.junit4.SpringRunner;
 
 import static org.hamcrest.CoreMatchers.is;
 import static org.junit.Assert.assertThat;
-import static org.springframework.cloud.stream.test.matcher.MessageQueueMatcher.receivesPayloadThat;
 
 /**
  * @author Glenn Renfro