feat(BridgeChannel): don't log channel objects

They are really verbose, and add no real value. In addition, log the channel
type once opened.

modules/RTC/BridgeChannel.js

         const emitter = this._eventEmitter;
 
         channel.onopen = () => {
-            logger.info('Channel opened by the Videobridge!', channel);
+            logger.info(`${this._mode} channel opened`);
 
             // Code sample for sending string and/or binary data.
             // Sends string message to the bridge:
         };
 
         channel.onerror = error => {
-            logger.error('Channel error:', error, channel);
+            logger.error('Channel error:', error);
         };
 
         channel.onmessage = ({ data }) => {
                 GlobalOnErrorHandler.callErrorHandler(error);
                 logger.error(
                     'Failed to parse channel message as JSON: ',
-                    data, channel, error);
+                    data, error);
 
                 return;
             }
         };
 
         channel.onclose = () => {
-            logger.info('Channel closed', channel);
+            logger.info('Channel closed');
 
             // Remove the channel.
             this._channel = null;