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[OpenStack Infra <1622002@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.openstack.org/366291
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=d4f92ede9ed52cd0b9059d993e3cf1f42d5ff57e
Submitter: Jenkins
Branch:    master

commit d4f92ede9ed52cd0b9059d993e3cf1f42d5ff57e
Author: Brian Haley <brian.haley@xxxxxxx>
Date:   Tue Sep 6 14:44:41 2016 -0400

    Fix dhcp_release6 error when not supported
    
    If the system does not have a version of dnsmasq that supports
    dhcp_release6, warn about but otherwise handle it gracefully, and also
    don't even try to execute it the next time.
    
    Closes-Bug: #1622002
    Related-Bug: #1624079
    Change-Id: I6bb9547f9d9a9fcfb2357521f3f5bd1dc1dd5136


** Changed in: neutron
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1622002

Title:
  dhcp_release6 can be called when it is not present

Status in neutron:
  Fix Released
Status in dnsmasq package in Ubuntu:
  New

Bug description:
  If someone enables dhcpv6-stateful addressing on a subnet, but they
  are running an old version of dnsmasq (<2.76), then the dhcp agent
  could try and run dhcp_release6 even though it isn't present.  An
  example:

  http://logs.openstack.org/53/365653/5/check/gate-tempest-dsvm-neutron-
  multinode-full-ubuntu-
  xenial/813d16d/logs/screen-q-dhcp.txt.gz#_2016-09-06_11_40_02_272

  Checking it's present first would fix this problem.

  Since the change to call dhcp_release6 was just added in
  https://review.openstack.org/#/c/301747/ we should fix this before
  Newton ships and people complain.

  There is also an effort to get Cirros to support DHCPv6 so that we can test this in the gate,
  https://bugs.launchpad.net/cirros/+bug/1487041 - hopefully that gets done so we can add a functional test.

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