[Bug 1677730] Re: keystone-manage mapping_engine is broken: TypeError

[Edward Hope-Morley]

@fnordahl having just realised that the patch you are backporting is
from another bug I'm afraid I'll have to ask you to stick to our usual
process for submitting SRUs i.e. always use the LP bug that the patch is
actually associated with. Please also ensure that all of the following
are extant in the bug when submit; (a) a link to the upstream stable
branch patch(es) if applicable (b) nominations for Ubuntu releases being
targeted (you can also add the cloud-archive project if you want but we
can take of that) and (c) the SRU template as you have provided here. If
you need to reference this bug for clarity that's fine. Thanks.

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https://bugs.launchpad.net/bugs/1677730

Title:
  keystone-manage mapping_engine is broken: TypeError

Status in OpenStack Identity (keystone):
  Invalid
Status in OpenStack Identity (keystone) newton series:
  In Progress
Status in OpenStack Identity (keystone) ocata series:
  Fix Released

Bug description:
  Running `keystone-manage mapping_engine` (with parameters) is broken:

  2017-03-30 16:09:11.982 13513 CRITICAL keystone [-] TypeError: __init__() takes exactly 3 arguments (2 given)
  2017-03-30 16:09:11.982 13513 ERROR keystone Traceback (most recent call last):
  2017-03-30 16:09:11.982 13513 ERROR keystone   File "/usr/bin/keystone-manage", line 10, in <module>
  2017-03-30 16:09:11.982 13513 ERROR keystone     sys.exit(main())
  2017-03-30 16:09:11.982 13513 ERROR keystone   File "/usr/lib/python2.7/site-packages/keystone/cmd/manage.py", line 44, in main
  2017-03-30 16:09:11.982 13513 ERROR keystone     cli.main(argv=sys.argv, config_files=config_files)
  2017-03-30 16:09:11.982 13513 ERROR keystone   File "/usr/lib/python2.7/site-packages/keystone/cmd/cli.py", line 1270, in main
  2017-03-30 16:09:11.982 13513 ERROR keystone     CONF.command.cmd_class.main()
  2017-03-30 16:09:11.982 13513 ERROR keystone   File "/usr/lib/python2.7/site-packages/keystone/cmd/cli.py", line 1143, in main
  2017-03-30 16:09:11.982 13513 ERROR keystone     rp = mapping_engine.RuleProcessor(rules['rules'])
  2017-03-30 16:09:11.982 13513 ERROR keystone TypeError: __init__() takes exactly 3 arguments (2 given)

  Affects mitaka, newton and ocata stable (centos-release).

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