Unable to delete a heat stack with lbaasv1 resources after upgrading from OSP8/9 ( with LBAAS v1) to OSP 10 (with LBaaS v2)

Issue

• Issue while deleting heat stacks , consisting of LBaaS v1 resources that were created in OSP8/9 environment after upgrading to OSP10 LBaaS v2.

• Stack Created before OSP Upgrade :-

  [stack@director]$ openstack stack list
  

  +--------------------------------------+------------+-----------------+----------------------+--------------+
  | ID                                   | Stack Name | Stack Status    | Creation Time        | Updated Time |
  +--------------------------------------+------------+-----------------+----------------------+--------------+
  | 1a1bd4df-8f36-4f01-b6a3-fd3209aaa649 | lbstack    | CREATE_COMPLETE | 2018-01-11T12:09:17Z | None         |
  | 6cb217dc-b76b-442d-9011-c91be4ecb8af | lbstack2   | CREATE_COMPLETE | 2018-01-11T10:09:39Z | None         |
  +--------------------------------------+------------+-----------------+----------------------+--------------+
  

• Error received if tried to delete the Heat Stack after OSP Upgrade:-

  [stack@director]$ openstack stack delete lbstack2
  

  [stack@director]$ openstack stack resource list lbstack2
  ERROR: HEAT-E99001 Service neutron is not available for resource type OS::Neutron::HealthMonitor, reason: Required extension lbaas in neutron service is not available.