Updated openstack/openstack
Project: openstack/nova  fa01320b84151f0d6ca1f1e8c4054f5d353f5fc4

Change v3 flavors to v2.1

This patch changes v3 flavors 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: I1e52c034a8c50fde3aa31e1e79c8f113424fd2e1