Change log level to DEBUG for batch configuration

Related to #5055

Author: fmbenhassine

spring-batch-core/src/main/java/org/springframework/batch/core/launch/support/TaskExecutorJobLauncher.java

@@ -283,7 +283,7 @@ public void setTaskExecutor(TaskExecutor taskExecutor) {
 	public void afterPropertiesSet() throws Exception {
 		Assert.state(jobRepository != null, "A JobRepository has not been set.");
 		if (taskExecutor == null) {
-			logger.info("No TaskExecutor has been set, defaulting to synchronous executor.");
+			logger.debug("No TaskExecutor has been set, defaulting to synchronous executor.");
 			taskExecutor = new SyncTaskExecutor();
 		}
 	}

spring-batch-core/src/main/java/org/springframework/batch/core/step/item/ChunkOrientedStep.java

@@ -317,11 +317,11 @@ public void registerSkipListener(SkipListener<I, O> skipListener) {
 	public void afterPropertiesSet() throws Exception {
 		super.afterPropertiesSet();
 		if (this.transactionManager == null) {
-			logger.info("No transaction manager has been set. Defaulting to ResourcelessTransactionManager.");
+			logger.debug("No transaction manager has been set. Defaulting to ResourcelessTransactionManager.");
 			this.transactionManager = new ResourcelessTransactionManager();
 		}
 		if (this.transactionAttribute == null) {
-			logger.info("No transaction attribute has been set. Defaulting to DefaultTransactionAttribute.");
+			logger.debug("No transaction attribute has been set. Defaulting to DefaultTransactionAttribute.");
 			this.transactionAttribute = new DefaultTransactionAttribute();
 		}
 		Assert.isTrue(this.chunkSize > 0, "Chunk size must be greater than 0");