http: ClientRequest might never emit close if has agent and is aborted

[ronag]

Not sure how to trigger this since I'm not a heavy agent user but looking at the following section:

https://github.com/nodejs/node/blob/master/lib/_http_client.js#L710

If I call abort it looks like only abort might be emitted and close is never.

[ronag]

@mcollina ping

[ronag]

I believe this has been resolved.