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This patch changes v3 admin-password API to v2.1 and backport v3 unit test cases to 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: I167753eddd188120236c51bade549c907c8a8466