Make EPIPE tracebacks go away (#595)
Make EPIPE tracebacks go away (#595)

These errors aren't very helpful and they tend to fill up logs. They could be
caused by something as innocent as `curl -N http://localhost:6006/ | head`. It
could also be caused by firewalls, or perhaps the browser abruptly navigating
somewhere else. So we wouldn't want users to mistake these as meaningful when
troubleshooting.
francoisluus/tensorboard-supervise,francoisluus/tensorboard-supervise,qiuminxu/tensorboard,francoisluus/tensorboard-supervise,tensorflow/tensorboard,qiuminxu/tensorboard,qiuminxu/tensorboard,tensorflow/tensorboard,tensorflow/tensorboard,tensorflow/tensorboard,francoisluus/tensorboard-supervise,tensorflow/tensorboard,tensorflow/tensorboard,qiuminxu/tensorboard,tensorflow/tensorboard,qiuminxu/tensorboard,qiuminxu/tensorboard,francoisluus/tensorboard-supervise,francoisluus/tensorboard-supervise