message: Channel initialization update
  setNextPlugin need to be called before init when channels config is not
  provided
diff: @@ -87,14 +87,15 @@ export class ChannelController implements ITelemetryPlugin {
  return a.priority - b.priority;
  });
  - // Initialize each plugin
  - arr.forEach(queueItem => queueItem.initialize(config, core, extensions));
  -
  // setup next plugin
  for (let i = 1; i < arr.length; i++) {
  - arr[i - 1].setNextPlugin(arr[i]);
  + arr[i - 1].
  + (arr[i]);
  }
  + // Initialize each plugin
  + arr.forEach(queueItem => queueItem.initialize(config, core, extensions));
  +
  this.channelQueue.push(arr);
  }
  }
  