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This patch changes v3 availability-zone 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: Ifbd152e431d182a5ccabac7fcc84fcc8a2fc6e5a