Ironic API doesn't use oslo service

[Anton Arefiev]

Ironic API should use oslo service instead of wsgiref. It brings some benefits here:

 - first of all it brings consistency with other Openstack projects(e.g. supporting HUP signal, etc);

 - here also all benefits from using common code;

 - also wsgiref is not recommend for production, it's limited in terms of concurrency because it's singlethreaded, which means it will be able to initiate websocket connections one at a time only. Also it's too buggy, related bug in ironic: https://bugs.launchpad.net/ironic/+bug/1296833

Wsgi mode under apache as alternative for high load environments could be used, but not all envs require such heavy server.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/219298

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/219298
Committed: https://git.openstack.org/cgit/openstack/ironic/commit/?id=c4bd20ebd4b42201bf40e00d4f0a1b2c69d2e931
Submitter: Jenkins
Branch: master

commit c4bd20ebd4b42201bf40e00d4f0a1b2c69d2e931
Author: Anton Arefiev <email address hidden>
Date: Tue Sep 1 17:51:37 2015 +0300

    Use wsgi from oslo.service for Ironic API

    oslo.service provides a wsgi functionality for defining new long-running
    services using by OpenStack applications. It might usefull for working with SSL for example.

    Ironic has started migrate to oslo.service, this change continue this work, and consumes wsgi from it.

    Change-Id: Ic7865709cd87c45e6b7d49f15ce73354aa15401e
    Closes-Bug: #1484044

[Doug Hellmann (doug-hellmann)]

This issue was fixed in the openstack/ironic 4.3.0 release.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/liberty
Review: https://review.openstack.org/287134

[OpenStack Infra (hudson-openstack)]

Change abandoned by Lucas Alvares Gomes (<email address hidden>) on branch: stable/liberty
Review: https://review.openstack.org/287134