In order to prevent a memory leak when using keep alive, ensure that the
timeout listener for the request is removed when the response has ended.
PR-URL: https://github.com/nodejs/node/pull/9440
Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
