[Bug 1495430] Re: delete lbaasv2 can't delete lbaas namespace automatically.

[OpenStack Infra]

Reviewed:  https://review.openstack.org/426209
Committed: https://git.openstack.org/cgit/openstack/neutron-lbaas/commit/?id=16a323dbf740d80bfb8f816025719e6bbf69d4e7
Submitter: Jenkins
Branch:    stable/newton

commit 16a323dbf740d80bfb8f816025719e6bbf69d4e7
Author: Zhou Zhihong <zhouzhihong at cmss.chinamobile.com>
Date:   Thu Jul 21 03:59:28 2016 -0700

    The lb namespace can not be deleted
    
    When delete the last listener, the lb instance was undeployed.
    But the lb namespace was not deleted at this time. After that,
    when delete the loadbalancer, the lb namespace will not be
    deleted for the exists() check always return False.
    
    Closes-Bug: #1495430
    (cherry picked from commit 9073940a82d3adf6581643941c059bf1d8bb8615)
    Change-Id: Ic3cb25a6bd2bf86f8c30ef62ae323c3bab0c82fc


** Tags added: in-stable-newton

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https://bugs.launchpad.net/bugs/1495430

Title:
  delete lbaasv2 can't delete lbaas namespace automatically.

Status in Ubuntu Cloud Archive:
  New
Status in neutron:
  New
Status in octavia:
  Fix Released
Status in neutron-lbaas package in Ubuntu:
  New

Bug description:
  Try the lbaas v2 in my env and found lots of orphan lbaas namespace. Look back to the code and find that lbaas instance will be undelployed, when delete listener. All things are deleted except the namespace.
  However, from the method of deleting loadbalancer, the namespace will be deleted automatically.
  The behavior is not consistent, namespace should be deleted from deleting listener too.

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