Show why we have an error during initialization

lib/controller.js

@@ -42,7 +42,7 @@ class Controller {
         this.startupLogVersion(() => {
             this.zigbee.start(this.handleZigbeeMessage, (error) => {
                 if (error) {
-                    logger.error('Failed to start');
+                    logger.error('Failed to start', error);
                 } else {
                     // Log zigbee clients on startup and configure.
                     const devices = this.zigbee.getAllClients();