Failed to stop stack error from functional tests with engine_workers=2

[Angus Salkeld]

After trying to enable 2 engine workers in the stack we got an error:
"
ERROR: Failed to stop stack (StackValidationTest-2106167672) on other engine (c37574aa-99c2-4e94-bc12-ae576a531db7)
"
http://logs.openstack.org/96/165396/1/check/check-heat-dsvm-functional-mysql/cbd0edd/console.html#_2015-03-18_13_44_19_397

Note in the engine logs:
"
oslo_messaging.rpc.dispatcher [-] Expected exception during message handling (Failed to stop stack (StackValidationTest-2106167672) on other engine (c37574aa-99c2-4e94-bc12-ae576a531db7)) _dispatch_and_reply /usr/local/lib/python2.7/dist-packages/oslo_messaging/rpc/dispatcher.py:145
"
http://logs.openstack.org/96/165396/1/check/check-heat-dsvm-functional-mysql/cbd0edd/logs/screen-h-eng.txt.gz#_2015-03-18_13_44_19_252

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/165712

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/165712
Committed: https://git.openstack.org/cgit/openstack/heat/commit/?id=f19c54dd9a906a538b527268b6746daa162da5ad
Submitter: Jenkins
Branch: master

commit f19c54dd9a906a538b527268b6746daa162da5ad
Author: Angus Salkeld <email address hidden>
Date: Mon Mar 23 09:23:28 2015 +1000

    Fix the topic and server that the listener client uses

    This was only working for one heat engine as it was sending
    the listener messages to a topic of "engine_id".

    Change-Id: Ib542d1ebb85b004f5a67213e678882c5a723dc0e
    Closes-bug: 1433821

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/juno
Review: https://review.openstack.org/210606

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/210606
Committed: https://git.openstack.org/cgit/openstack/heat/commit/?id=70fb2e8d05e8a9c9a08e6b81c38567bd33c5bba2
Submitter: Jenkins
Branch: stable/juno

commit 70fb2e8d05e8a9c9a08e6b81c38567bd33c5bba2
Author: Angus Salkeld <email address hidden>
Date: Mon Mar 23 09:23:28 2015 +1000

    Fix the topic and server that the listener client uses

    This was only working for one heat engine as it was sending
    the listener messages to a topic of "engine_id".

    Change-Id: Ib542d1ebb85b004f5a67213e678882c5a723dc0e
    Closes-bug: 1433821
    (cherry picked from commit f19c54dd9a906a538b527268b6746daa162da5ad)