fix ControlledDynamicWebAppCluster.stop when child unmanaged
Convert DynamicWebAppClusterTest from groovy to java
Rename JavaWebAppTestEntities.groovy to TestJavaWebAppEntity.groovy

- so matches class in that file
Merge pull request #1478 from aledsage/fix/cluster-stop-when-child-unmanaged

Fix: cluster.stop when child unmanaged