add poweroff and reboot functions

client/power/power.go

@@ -0,0 +1,9 @@
+package power
+
+const APIVersion string = "power/v1alpha1"
+
+type PowerActionResponse struct {
+	APIVersion string `json:"apiVersion"`
+	Action     string `json:"action"`
+	Success    bool   `json:"success"`
+}