OO-538: prevent RS if someone logged with a lock ( edit a business group) make a logout/login

src/main/java/org/olat/commons/coordinate/cluster/lock/ClusterLockManager.java

@@ -94,7 +94,8 @@ public class ClusterLockManager extends BasicManager {
 
 	void deleteLock(LockImpl li) {
 		log.info("deleteLock: "+li+" START");
-		dbInstance.getCurrentEntityManager().remove(li);		
+		dbInstance.getCurrentEntityManager().remove(li);
+		dbInstance.commit();//prevent stale object by logout login
 		log.info("deleteLock: "+li+" END");
 	}