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[Bug 1571097] [NEW] unable to delete lbaasv2 health monitor if its listener deleted

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Public bug reported:

problem is in Kilo neutron-lbaas branch.

monitor is attached a pool.
When pool and listener were deleted, not error reported that there is a health-monitor associated to pool.

If all lbaas resoruces except health-monitor were deleted, health
monitor can not be deleted.

See the following procedure to reproduce this issue:

$ neutron lbaas-loadbalancer-create --name=v-lb2 lb2-v-1574810802
$ neutron lbaas-listener-create --protocol=HTTP --protocol-port=80 --name=v-lb2-1 --loadbalancer=v-lb2
$ neutron lbaas-pool-create --lb-algorithm=ROUND_ROBIN --protocol=HTTP --name=v-lb2-pool  --listener=v-lb2-1
$ neutron lbaas-member-create --subnet lb2-v-1574810802 --address 10.199.88.3 --protocol-port=80 v-lb2-pool
$ neutron lbaas-member-create --subnet lb2-v-1574810802 --address 10.199.88.4 --protocol-port=80 v-lb2-pool
$ neutron lbaas-healthmonitor-create --max-retries=3 --delay=3 --timeout=10 --type=HTTP --pool=v-lb2-pool
$ neutron lbaas-member-delete 4d2977fc-5600-4dbf-8af2-35c017c8f4a0 v-lb2-pool 
$ neutron lbaas-member-delete 2f60a49b-add1-43d6-97d8-4e53a925b25f  v-lb2-pool 
$ neutron lbaas-pool-delete v-lb2-pool
$ neutron lbaas-listener-delete v-lb2-1
$ neutron lbaashealthmonitor-delete 044f98a5-755d-498d-a38e-18eb8ca13884

neutron log seems point to lbaas resources were gone.
In this specific issue, we should just remove the health monitor from system.

2016-04-10 16:57:38.220 INFO neutron.wsgi [req-7e697943-e70d-4ac8-a840-b1edf441806a Venus Venus] 10.34.57.68 - - [10/Apr/2016 16:57:38] "GET /v2.0/lbaas/healthmonitors.json?fields=id&id=044f98a5-755d-498d-a38e-18eb8ca13884 HTTP/1.1" 200 444 0.112257
2016-04-10 16:57:38.252 ERROR neutron.api.v2.resource [req-aaeae392-33b2-427c-96a0-918782882c9a Venus Venus] delete failed
2016-04-10 16:57:38.252 4158 TRACE neutron.api.v2.resource Traceback (most recent call last):
2016-04-10 16:57:38.252 4158 TRACE neutron.api.v2.resource   File "/opt/stack/neutron/neutron/api/v2/resource.py", line 83, in resource
2016-04-10 16:57:38.252 4158 TRACE neutron.api.v2.resource     result = method(request=request, **args)
2016-04-10 16:57:38.252 4158 TRACE neutron.api.v2.resource   File "/opt/stack/neutron/neutron/api/v2/base.py", line 490, in delete
2016-04-10 16:57:38.252 4158 TRACE neutron.api.v2.resource     obj_deleter(request.context, id, **kwargs)
2016-04-10 16:57:38.252 4158 TRACE neutron.api.v2.resource   File "/opt/stack/neutron-lbaas/neutron_lbaas/services/loadbalancer/plugin.py", line 906, in delete_healthmonitor
2016-04-10 16:57:38.252 4158 TRACE neutron.api.v2.resource     constants.PENDING_DELETE)
2016-04-10 16:57:38.252 4158 TRACE neutron.api.v2.resource   File "/opt/stack/neutron-lbaas/neutron_lbaas/db/loadbalancer/loadbalancer_dbv2.py", line 163, in test_and_set_status
2016-04-10 16:57:38.252 4158 TRACE neutron.api.v2.resource     db_lb_child.root_loadbalancer.id)
2016-04-10 16:57:38.252 4158 TRACE neutron.api.v2.resource   File "/opt/stack/neutron-lbaas/neutron_lbaas/db/loadbalancer/models.py", line 115, in root_loadbalancer
2016-04-10 16:57:38.252 4158 TRACE neutron.api.v2.resource     return self.pool.listener.loadbalancer
2016-04-10 16:57:38.252 4158 TRACE neutron.api.v2.resource AttributeError: 'NoneType' object has no attribute 'listener'
2016-04-10 16:57:38.252 4158 TRACE neutron.api.v2.resource 
2016-04-10 16:57:38.253 INFO neutron.wsgi [req-aaeae392-33b2-427c-96a0-918782882c9a Venus Venus] 10.34.57.68 - - [10/Apr/2016 16:57:38] "DELETE /v2.0/lbaas/healthmonitors/044f98a5-755d-498d-a38e-18eb8ca13884.json HTTP/1.1" 500 383 0.030720

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1571097

Title:
  unable to delete lbaasv2 health monitor if its listener deleted

Status in neutron:
  New

Bug description:
  problem is in Kilo neutron-lbaas branch.

  monitor is attached a pool.
  When pool and listener were deleted, not error reported that there is a health-monitor associated to pool.

  If all lbaas resoruces except health-monitor were deleted, health
  monitor can not be deleted.

  See the following procedure to reproduce this issue:

  $ neutron lbaas-loadbalancer-create --name=v-lb2 lb2-v-1574810802
  $ neutron lbaas-listener-create --protocol=HTTP --protocol-port=80 --name=v-lb2-1 --loadbalancer=v-lb2
  $ neutron lbaas-pool-create --lb-algorithm=ROUND_ROBIN --protocol=HTTP --name=v-lb2-pool  --listener=v-lb2-1
  $ neutron lbaas-member-create --subnet lb2-v-1574810802 --address 10.199.88.3 --protocol-port=80 v-lb2-pool
  $ neutron lbaas-member-create --subnet lb2-v-1574810802 --address 10.199.88.4 --protocol-port=80 v-lb2-pool
  $ neutron lbaas-healthmonitor-create --max-retries=3 --delay=3 --timeout=10 --type=HTTP --pool=v-lb2-pool
  $ neutron lbaas-member-delete 4d2977fc-5600-4dbf-8af2-35c017c8f4a0 v-lb2-pool 
  $ neutron lbaas-member-delete 2f60a49b-add1-43d6-97d8-4e53a925b25f  v-lb2-pool 
  $ neutron lbaas-pool-delete v-lb2-pool
  $ neutron lbaas-listener-delete v-lb2-1
  $ neutron lbaashealthmonitor-delete 044f98a5-755d-498d-a38e-18eb8ca13884

  neutron log seems point to lbaas resources were gone.
  In this specific issue, we should just remove the health monitor from system.

  2016-04-10 16:57:38.220 INFO neutron.wsgi [req-7e697943-e70d-4ac8-a840-b1edf441806a Venus Venus] 10.34.57.68 - - [10/Apr/2016 16:57:38] "GET /v2.0/lbaas/healthmonitors.json?fields=id&id=044f98a5-755d-498d-a38e-18eb8ca13884 HTTP/1.1" 200 444 0.112257
  2016-04-10 16:57:38.252 ERROR neutron.api.v2.resource [req-aaeae392-33b2-427c-96a0-918782882c9a Venus Venus] delete failed
  2016-04-10 16:57:38.252 4158 TRACE neutron.api.v2.resource Traceback (most recent call last):
  2016-04-10 16:57:38.252 4158 TRACE neutron.api.v2.resource   File "/opt/stack/neutron/neutron/api/v2/resource.py", line 83, in resource
  2016-04-10 16:57:38.252 4158 TRACE neutron.api.v2.resource     result = method(request=request, **args)
  2016-04-10 16:57:38.252 4158 TRACE neutron.api.v2.resource   File "/opt/stack/neutron/neutron/api/v2/base.py", line 490, in delete
  2016-04-10 16:57:38.252 4158 TRACE neutron.api.v2.resource     obj_deleter(request.context, id, **kwargs)
  2016-04-10 16:57:38.252 4158 TRACE neutron.api.v2.resource   File "/opt/stack/neutron-lbaas/neutron_lbaas/services/loadbalancer/plugin.py", line 906, in delete_healthmonitor
  2016-04-10 16:57:38.252 4158 TRACE neutron.api.v2.resource     constants.PENDING_DELETE)
  2016-04-10 16:57:38.252 4158 TRACE neutron.api.v2.resource   File "/opt/stack/neutron-lbaas/neutron_lbaas/db/loadbalancer/loadbalancer_dbv2.py", line 163, in test_and_set_status
  2016-04-10 16:57:38.252 4158 TRACE neutron.api.v2.resource     db_lb_child.root_loadbalancer.id)
  2016-04-10 16:57:38.252 4158 TRACE neutron.api.v2.resource   File "/opt/stack/neutron-lbaas/neutron_lbaas/db/loadbalancer/models.py", line 115, in root_loadbalancer
  2016-04-10 16:57:38.252 4158 TRACE neutron.api.v2.resource     return self.pool.listener.loadbalancer
  2016-04-10 16:57:38.252 4158 TRACE neutron.api.v2.resource AttributeError: 'NoneType' object has no attribute 'listener'
  2016-04-10 16:57:38.252 4158 TRACE neutron.api.v2.resource 
  2016-04-10 16:57:38.253 INFO neutron.wsgi [req-aaeae392-33b2-427c-96a0-918782882c9a Venus Venus] 10.34.57.68 - - [10/Apr/2016 16:57:38] "DELETE /v2.0/lbaas/healthmonitors/044f98a5-755d-498d-a38e-18eb8ca13884.json HTTP/1.1" 500 383 0.030720

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