Updated openstack/openstack
Project: openstack/nova  d616c963879b0fda49a6fbee0d98077ffd5322e0

Convert v3 certificate API to v2.1

This patch changes v3 certificate API to v2.1 and makes v2
unit tests share between v2 and v2.1.

The differences between v2 and v3 are described on the wiki page
https://wiki.openstack.org/wiki/NovaAPIv2tov3.

Partially implements blueprint v2-on-v3-api

Change-Id: I8e6556dffbc14334f7ec1b9db38fbbfe2387bef0