make single-proc congress default in devstack

[Eric K]

This patch [1] added the ability to start Congress in separate processes, but based on ML discussion [2], we would like the default to remain single process for the Newton release.

The change needed is to add an option that chooses between single-process and multi-process deployments.

Additionally, in single process mode, we should set in conf file [DEFAULT] transport_url = 'kombu+memory://'

[1] https://review.openstack.org/#/c/352808/
[2] http://lists.openstack.org/pipermail/openstack-dev/2016-September/103573.html

[Anusha (anusha-iiitm)]

Thanks Eric.
Just to clarify if I'm on same page

Devstack User deployemnt:
single process deployment
default transport_url = 'kombu+memory://'

For gate testing ( need to change the config in infra):
Multi process deployment
transport url = rabbit (as its the common driver used in real world scenarios, maybe testing withit is worthwhile.)

[Eric K (ekcs)]

Yup, that's what I am thinking. Does that make sense? Thanks!

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/373140

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/373140
Committed: https://git.openstack.org/cgit/openstack/congress/commit/?id=f40fd1b16fb0f71aeeb61bf64020d2b134c2b6b9
Submitter: Jenkins
Branch: master

commit f40fd1b16fb0f71aeeb61bf64020d2b134c2b6b9
Author: Anusha Ramineni <email address hidden>
Date: Tue Sep 20 15:51:49 2016 +0530

    Default to single process in devstack

    This commit defaults to starting single congress process through
    devstack and defaults kombu+memory as messaging driver .

    TODO(ramineni): Gate jobs to run on multi process and rabbit driver

    Change-Id: I0951b6d9693a24faca68e4daedf13f253e965404
    Partial-Bug:#1624172

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/newton
Review: https://review.openstack.org/378241

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/378241
Committed: https://git.openstack.org/cgit/openstack/congress/commit/?id=102967af2d252c7dc6030bca4da57e5428325e7b
Submitter: Jenkins
Branch: stable/newton

commit 102967af2d252c7dc6030bca4da57e5428325e7b
Author: Anusha Ramineni <email address hidden>
Date: Tue Sep 20 15:51:49 2016 +0530

    Default to single process in devstack

    This commit defaults to starting single congress process through
    devstack and defaults kombu+memory as messaging driver .

    TODO(ramineni): Gate jobs to run on multi process and rabbit driver

    Change-Id: I0951b6d9693a24faca68e4daedf13f253e965404
    Partial-Bug:#1624172
    (cherry picked from commit f40fd1b16fb0f71aeeb61bf64020d2b134c2b6b9)