Samples cleanup

- Move common properties to samples parent
 - Avoid explicit `ComponentScan` by moving all the classes to the same package

spring-cloud-stream-samples/transform/src/main/java/demo/LoggingTransformer.java

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package transform;
+package demo;
 
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;

spring-cloud-stream-samples/transform/src/main/java/demo/TransformApplication.java

@@ -18,12 +18,8 @@ package demo;
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
-import org.springframework.context.annotation.ComponentScan;
-
-import transform.LoggingTransformer;
 
 @SpringBootApplication
-@ComponentScan(basePackageClasses=LoggingTransformer.class)
 public class TransformApplication {
 
 	public static void main(String[] args) {