This completes the verification for the diagnostics API. As the
response is still dumping out raw hypervisor stats (for compatibility
7529b94f4a/nova/api/openstack/compute/server_diagnostics.py (L38-L44))
the best we can say about the response is it's hypervisor specific and
don't use it.
In future we should use the standardized format that was defined
during the v3 effort.
Part of bp:api-ref-in-rst
Change-Id: Id2cca6a2f79542bec17a34aa3d31924e8ed7b9e5
8f4e803634