Starting to move to java 11[Do Not Merge]

All version changes are present.

Fixed all Java-Doc Errors and warnings

* Due to the stricter nature of the javadoc compiler we can't wrap <ul> / <ui> in <p>
* We will also need to Push up a test app for taklauncher to work with.   The old one fails to start now.   Or use one of the task starters possibly.
* Built on the work from TASK-439C.   Wait for that merge before merging this one.
* Replaced applicationFailedEvent class attribute with applicaitonFailedException
* Also polished the app used by the taskLauncherSink integration test

spring-cloud-task-batch/src/main/java/org/springframework/cloud/task/batch/listener/support/MapTaskBatchDao.java

@@ -25,8 +25,8 @@ import org.springframework.cloud.task.repository.TaskExecution;
 import org.springframework.util.Assert;
 
 /**
- * Map implementation of the {@link TaskBatchDao}.  <note>This is intended for testing
- * purposes only!</note>
+ * Map implementation of the {@link TaskBatchDao}.  <p> This is intended for
+ * testing purposes only!</p>
  *
  * @author Michael Minella
  */