This change fixes a few things with the recently added
"os_interface" option in the [placement] config group.
1. It adds tests for the scheduler report client that
were missing in the original change that added the
config option.
2. It uses the option in the "nova-status upgrade check"
command so it is consistent with how the scheduler
report client uses it.
3. It removes the restrictive choices list from the
config option definition. keystoneauth1 allows an
"auth" value for the endpoint interface which means
don't use the service catalog to find the endpoint
but instead just read it from the "auth_url" config
option. Also, the Keystone v3 API performs strict
validation of the endpoint interface when creating
an endpoint record. The list of supported interfaces
may change over time, so we shouldn't encode that
list within Nova.
4. As part of removing the choices, the release note
associated with the new option is updated and changed
from a 'feature' release note to simply 'other' since
it's not really a feature as much as it is a bug fix.
Change-Id: Ia5af05cc4d8155349bab942280c83e7318749959
Closes-Bug: #1664334
6b0f82192b