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'os-start/os-stop' server actions were missed for V2.1 API. This patch converts 'os-start/os-stop' server action for V2.1 API The differences between v2 and v3 are described on the wiki page https://wiki.openstack.org/wiki/NovaAPIv2tov3. Closes-Bug: #1367575 Change-Id: I8b0f27fb639034d368bcc1fc51d20daf9c2cdeb5