Handle SetServer request

- Setting server URL in both /config/server and real config partition

Signed-off-by: Mikhail Malyshev <mike.malyshev@gmail.com>

pkg/pillar/cmd/monitor/ipc_server.go

@@ -48,7 +48,7 @@ func (r *Request) validate() error {
 		return errors.New("RequestData is nil")
 	}
 	// check supported request types
-	if r.RequestType != "SetDPC" {
+	if (r.RequestType != "SetDPC") && (r.RequestType != "SetServer") {
 		return errors.New("Unsupported RequestType " + r.RequestType)
 	}
 	return nil
@@ -230,6 +230,17 @@ func (r *Request) handleRequest(ctx *monitorContext) *Response {
 		} else {
 			return r.malformedRequestResponse(err)
 		}
+	case "SetServer":
+		var server string
+		if err := json.Unmarshal(r.RequestData, &server); err == nil {
+			if err := ctx.updateServerFile(server); err != nil {
+				return r.errResponse("Failed to update server file", err)
+			} else {
+				return r.okResponse()
+			}
+		} else {
+			return r.malformedRequestResponse(err)
+		}
 	default:
 		return r.unknownRequestResponse()
 	}