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/timestamp/src/test/java/org/springframework/cloud/task/timestamp/TimestampTaskPropertiesTests.java

@@ -20,7 +20,7 @@ import static org.junit.Assert.assertEquals;
 
 import org.junit.Test;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
-import org.springframework.boot.test.util.EnvironmentTestUtils;
+import org.springframework.boot.test.util.TestPropertyValues;
 import org.springframework.context.annotation.AnnotationConfigApplicationContext;
 import org.springframework.context.annotation.Configuration;
 
@@ -32,7 +32,8 @@ public class TimestampTaskPropertiesTests {
 	@Test(expected = IllegalArgumentException.class)
 	public void testEmptyFormat() {
 		AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext();
-		EnvironmentTestUtils.addEnvironment(context, "format:");
+		TestPropertyValues testPropertyValues = TestPropertyValues.of("format:");
+		testPropertyValues.applyTo(context);
 		context.register(Conf.class);
 		context.refresh();
 		TimestampTaskProperties properties = context.getBean(TimestampTaskProperties.class);