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This patch convert v3 hypervisor plugin to v2.1 and makes v2 unit tests share between v2 and v2.1. Unit tests has been modified in optimized way. 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: I23ffc10d4c0170cb43ef8aeebf69ae2794a08827