ikev2: Insert MOBIKE tasks at the front of the queue

In case we have no usable path to the other peer there is no point in
initiating any other tasks (like rekeying).

src/libcharon/sa/ikev2/task_manager_v2.c

@@ -1246,6 +1246,8 @@ METHOD(task_manager_t, process_message, status_t,
 METHOD(task_manager_t, queue_task, void,
 	private_task_manager_t *this, task_t *task)
 {
+	int pos = ARRAY_TAIL;
+
 	if (task->get_type(task) == TASK_IKE_MOBIKE)
 	{	/*  there is no need to queue more than one mobike task */
 		enumerator_t *enumerator;
@@ -1262,9 +1264,12 @@ METHOD(task_manager_t, queue_task, void,
 			}
 		}
 		enumerator->destroy(enumerator);
+		/* insert MOBIKE tasks first as we currently might not have a usable
+		 * path to initiate any other tasks */
+		pos = ARRAY_HEAD;
 	}
 	DBG2(DBG_IKE, "queueing %N task", task_type_names, task->get_type(task));
-	array_insert(this->queued_tasks, ARRAY_TAIL, task);
+	array_insert(this->queued_tasks, pos, task);
 }
 
 /**