AMBARI-7152. Admin View: User is still present as group member after deleting.

ambari-server/src/main/java/org/apache/ambari/server/orm/dao/GroupDAO.java

@@ -92,6 +92,7 @@ public class GroupDAO {
   @Transactional
   public void remove(GroupEntity group) {
     entityManagerProvider.get().remove(merge(group));
+    entityManagerProvider.get().getEntityManagerFactory().getCache().evictAll();
   }
 
   @Transactional

ambari-server/src/main/java/org/apache/ambari/server/orm/dao/UserDAO.java

@@ -103,6 +103,7 @@ public class UserDAO {
   @Transactional
   public void remove(UserEntity user) {
     entityManagerProvider.get().remove(merge(user));
+    entityManagerProvider.get().getEntityManagerFactory().getCache().evictAll();
   }
 
   @Transactional