stream: Throw on 'error' if listeners removed

[isaacs]

In this situation:

writable.on('error', handler);
readable.pipe(writable);
writable.removeListener('error', handler);
writable.emit('error', new Error('boom'));

there is actually no error handler, but it doesn't throw, because of the
fix for stream.once('error', handler), in 23d92ec.

Note that simply reverting that change is not valid either, because
otherwise this will emit twice, being handled the first time, and then
throwing the second:

writable.once('error', handler);
readable.pipe(writable);
writable.emit('error', new Error('boom'));

Fix this with a horrible hack to make the stream pipe onerror handler
added before any other userland handlers, so that our handler is not
affected by adding or removing any userland handlers.

Closes #6007.

[isaacs]

Oh, whoops, this should be against v0.10, not master. If someone LGTM's it, I can merge.

[indutny]

LGTM.

[kanongil]

Great! We have now come full circle on this issue, and have arrived at my originally proposed fix which you advocated against at the time.