message: Stress: Only disconnect socket if not disposed
  Only disconnect socket in offline case if socket not already disposed
diff: @@ -274,8 +274,10 @@ export class FaultInjectionDocumentDeltaConnection
  public goOffline() {
  this.online = false;
  + if (!this.disposed) {
  this.injectDisconnect();
  }
  + }
  public goOnline() {
  this.online = true;
  