OPEN - issue BATCH-541: pull commit interval from the job parameters

Move ClassPathXmlApplicationContextJobFactory implementation from samples to core.

spring-batch-samples/src/test/java/org/springframework/batch/sample/dao/JdbcJobRepositoryTests.java

@@ -195,7 +195,7 @@ public class JdbcJobRepositoryTests extends AbstractTransactionalDataSourceSprin
 		cacheJobIds(execution);
 
 		int count = 0;
-		while (list.size() == 0 && count++ < 10) {
+		while (list.size() == 0 && count++ < 100) {
 			Thread.sleep(200);
 		}