stack delete cancelled on a volume resource

[Removed by request]

After I hit https://bugs.launchpad.net/heat/+bug/1638476 I wanted to delete the stack (some more info on that bug).
The nova server has a volume resource attached to it

nested_server.yaml:

heat_template_version: 2016-04-08
description: Nova Server

parameters:
  image:
    type: string
  key_name:
    type: string
  flavor:
    type: string
  private_network:
    type: string
  private_subnet:
    type: string
  availability_zone:
    type: string
    default: nova
  flavor:
    type: string
    default: heat.tiny

resources:
  server:
    type: OS::Nova::Server
    properties:
      availability_zone: { get_param: availability_zone }
      flavor: { get_param: flavor }
      image: { get_param: image }
      key_name: { get_param: key_name }
      networks:
        - port: { get_resource: server_port }
    depends_on: server_port

  server_port:
    type: OS::Neutron::Port
    properties:
      network: { get_param: private_network }
      fixed_ips:
        - subnet_id: { get_param: private_subnet }

  volume:
    type: Test::Volume
    properties:
      nova_instance: {get_resource: server}
      availability_zone: { get_param: availability_zone }

outputs:
  instance_ip:
    value: { get_attr: [server, first_address] }

LOG:

2016-11-02 07:26:52.633 3164 DEBUG heat.engine.scheduler [req-0c463d72-3099-4094-8a9c-4ad7fb52a0af 2e44c8e9d6c3418db3f78655bba7bb80 9e4cdbb57f2b41f2ae30a3b154843bab - - -] Task delete from TemplateResource "volume" [76de4720-e0c3-4f5d-9c7e-9bb0f7d261e1] Stack "test007-server-f5cpup3tsphx" [1ec273e5-ac6d-4e00-a911-b0d4d96fe15b] running step /usr/lib/python2.7/site-packages/heat/engine/scheduler.py:216
2016-11-02 07:26:52.638 3164 INFO heat.engine.resource [req-0c463d72-3099-4094-8a9c-4ad7fb52a0af 2e44c8e9d6c3418db3f78655bba7bb80 9e4cdbb57f2b41f2ae30a3b154843bab - - -] DELETE: TemplateResource "volume" [76de4720-e0c3-4f5d-9c7e-9bb0f7d261e1] Stack "test007-server-f5cpup3tsphx" [1ec273e5-ac6d-4e00-a911-b0d4d96fe15b]
2016-11-02 07:26:52.638 3164 ERROR heat.engine.resource Traceback (most recent call last):
2016-11-02 07:26:52.638 3164 ERROR heat.engine.resource File "/usr/lib/python2.7/site-packages/heat/engine/resource.py", line 753, in _action_recorder
2016-11-02 07:26:52.638 3164 ERROR heat.engine.resource yield
2016-11-02 07:26:52.638 3164 ERROR heat.engine.resource File "/usr/lib/python2.7/site-packages/heat/engine/resource.py", line 1669, in delete
2016-11-02 07:26:52.638 3164 ERROR heat.engine.resource *action_args)
2016-11-02 07:26:52.638 3164 ERROR heat.engine.resource File "/usr/lib/python2.7/site-packages/heat/engine/scheduler.py", line 353, in wrapper
2016-11-02 07:26:52.638 3164 ERROR heat.engine.resource step = next(subtask)
2016-11-02 07:26:52.638 3164 ERROR heat.engine.resource File "/usr/lib/python2.7/site-packages/heat/engine/resource.py", line 806, in action_handler_task
2016-11-02 07:26:52.638 3164 ERROR heat.engine.resource done = check(handler_data)
2016-11-02 07:26:52.638 3164 ERROR heat.engine.resource File "/usr/lib/python2.7/site-packages/heat/engine/resources/stack_resource.py", line 540, in check_delete_complete
2016-11-02 07:26:52.638 3164 ERROR heat.engine.resource return self._check_status_complete(self.DELETE)
2016-11-02 07:26:52.638 3164 ERROR heat.engine.resource File "/usr/lib/python2.7/site-packages/heat/engine/resources/stack_resource.py", line 404, in _check_status_complete
2016-11-02 07:26:52.638 3164 ERROR heat.engine.resource action=action)
2016-11-02 07:26:52.638 3164 ERROR heat.engine.resource ResourceFailure: resources.volume: Stack DELETE cancelled
2016-11-02 07:26:52.638 3164 ERROR heat.engine.resource
2016-11-02 07:26:52.708 3164 DEBUG oslo_messaging._drivers.amqpdriver [req-0c463d72-3099-4094-8a9c-4ad7fb52a0af 2e44c8e9d6c3418db3f78655bba7bb80 9e4cdbb57f2b41f2ae30a3b154843bab - - -] CAST unique_id: 40b896827ed947feafa6887bee367546 NOTIFY exchange 'heat' topic 'notifications.error' _send /usr/lib/python2.7/site-packages/oslo_messaging/_drivers/amqpdriver.py:432
2016-11-02 07:26:52.740 3164 INFO heat.engine.stack [req-0c463d72-3099-4094-8a9c-4ad7fb52a0af 2e44c8e9d6c3418db3f78655bba7bb80 9e4cdbb57f2b41f2ae30a3b154843bab - - -] Stack DELETE FAILED (test007-server-f5cpup3tsphx): Resource DELETE failed: resources.volume: Stack DELETE cancelled