Ironic API service does not start with default audit.ignore_req_list conf option

[Yuriy Zveryanskyy]

If we do not want ignore any HTTP method in audit middleware default None value causes error:

2016-12-08 09:55:23.403 TRACE ironic Traceback (most recent call last):
2016-12-08 09:55:23.403 TRACE ironic File "/usr/local/bin/ironic-api", line 10, in <module>
2016-12-08 09:55:23.403 TRACE ironic sys.exit(main())
2016-12-08 09:55:23.403 TRACE ironic File "/opt/stack/ironic/ironic/cmd/api.py", line 42, in main
2016-12-08 09:55:23.403 TRACE ironic server = wsgi_service.WSGIService('ironic_api', CONF.api.enable_ssl_api)
2016-12-08 09:55:23.403 TRACE ironic File "/opt/stack/ironic/ironic/common/wsgi_service.py", line 37, in __init__
2016-12-08 09:55:23.403 TRACE ironic self.app = app.VersionSelectorApplication()
2016-12-08 09:55:23.403 TRACE ironic File "/opt/stack/ironic/ironic/api/app.py", line 98, in __init__
2016-12-08 09:55:23.403 TRACE ironic self.v1 = setup_app(pecan_config=pc)
2016-12-08 09:55:23.403 TRACE ironic File "/opt/stack/ironic/ironic/api/app.py", line 67, in setup_app
2016-12-08 09:55:23.403 TRACE ironic ignore_req_list=CONF.audit.ignore_req_list
2016-12-08 09:55:23.403 TRACE ironic File "/usr/local/lib/python2.7/dist-packages/keystonemiddleware/audit/__init__.py", line 95, in __init__
2016-12-08 09:55:23.403 TRACE ironic conf.get('ignore_req_list', '').split(',')]
2016-12-08 09:55:23.403 TRACE ironic AttributeError: 'NoneType' object has no attribute 'split'

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/408572

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/408572
Committed: https://git.openstack.org/cgit/openstack/ironic/commit/?id=8bcee6e20656656963bb4e546e552aeeaee9be90
Submitter: Jenkins
Branch: master

commit 8bcee6e20656656963bb4e546e552aeeaee9be90
Author: Yuriy Zveryanskyy <email address hidden>
Date: Thu Dec 8 13:19:00 2016 +0200

    Fix default value of "ignore_req_list" config option

    If audit is enabled ironic API service does not start with default
    value (None) of "ignore_req_list" config option. This patch changes
    default value to empty string. Related modification added to ironic
    sample config.

    Closes-Bug: 1648387
    Change-Id: Ifbbbed4012670b4b05fcf63e5586024f3c927875

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/ironic 7.0.0 release.