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keepalive: implement _close_conn() so closes are known

Keepalives were not working on Python 3 because
http.client.HTTPResponse was refactored to call _close_conn()
instead of close(). Our custom close() is what returns inactive
connections to the available state.

We better support Python 3 by implementing a _close_conn().

Differential Revision: https://phab.mercurial-scm.org/D5720

copyright (c) 2006-2010 David JEAN LOUIS

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