Add a test for the version so deployer doesn't get deployed

Also unignore test in dataflow server

spring-cloud-launcher/spring-cloud-launcher-dataflow/src/test/java/org/springframework/cloud/launcher/dataflow/DeployerApplicationTests.java

@@ -11,7 +11,6 @@ import org.springframework.test.context.junit4.SpringRunner;
 @SpringBootTest({ "spring.cloud.bus.enabled=false", "eureka.client.enabled=false" })
 public class DeployerApplicationTests {
 
-	@Ignore("dataflox server is not compatible with boot 1.5.3")
 	@Test
 	public void contextLoads() {
 	}