CP-24774: replace control/feature flags according to xen upstream design

located at http://xenbits.xen.org/gitweb/?p=xen.git;a=blob;f=docs/misc/xenstore-paths.markdown;h=7be2592c74799fb0a1303ce7ab48613a84ffce21;hb=HEAD

- `shutdown` becomes `poweroff`
- `reboot` is added

Signed-off-by: Marcus Granado <[email protected]>

Author: mg12ctx

xc/device.ml

@@ -1999,7 +1999,7 @@ module Backend = struct
                 if is_hvm_linux pv_info then
                 begin
                   let write_local_domain prefix x = xs.Xs.write (Printf.sprintf "/local/domain/%d/%s%s" domid prefix x) "1" in
-                  List.iter (write_local_domain "control/feature-") ["suspend"; "shutdown"; "vcpu-hotplug"];
+                  List.iter (write_local_domain "control/feature-") ["suspend"; "poweroff"; "reboot"; "vcpu-hotplug"];
                   List.iter (write_local_domain "data/") ["updated"]
                 end
               )