We support oslo.config, so use Use keystonemiddleware auth credentials
instead of auth options ourselves.
Notes:
Below items will be used to get ironic client forever, not DEPRECATED,
but, in the case of keystone authentication, they are DEPRECATED.
Use [keystone_authtoken]'s items instead of them.
[ironic]
* os_auth_url
* os_username
* os_password
* os_tenant_name
And also this patch set drop default value of os_auth_url and identity_url,
so that this change will break people relying on ether/both of them.
Change-Id: Ib0774b6027bb60910dd4b5c2bc8acea0069ba0a1
Closes-Bug: #1435882
274e1e9d2b