Improve low power mode (#859)

-add switch on HASS
-avoid issue when using ESPWifiManualSetup
-Correct issue on gateway discovery on first connect
-stop processing during discovery

main/ZgatewayRF2.ino

@@ -112,7 +112,7 @@ void RF2toMQTTdiscovery(JsonObject& data) {
                   (char*)getUniqueId(switchRF[1], "").c_str(), will_Topic,
                   switchRF[3], switchRF[4], switchRF[5], switchRF[6],
                   switchRF[7], 0, "", "", true, subjectMQTTtoRF2,
-                  "", "", "", "");
+                  "", "", "", "", false);
 }
 #  endif