BATCH-63: added abstract keyword

Author: trisberg

spring-batch-core/src/test/java/org/springframework/batch/core/configuration/xml/AbstractTestComponent.java

@@ -1,6 +1,6 @@
 package org.springframework.batch.core.configuration.xml;
 
-public class AbstractTestComponent {
+public abstract class AbstractTestComponent {
 
 	protected boolean executed = false;