httppeer: add support for httppostargs when we're sending a file
This is probably only used in the 'unbundle' command, but the code
ended up being cleaner to make it generic and treat *all* httppostargs
with a non-args request body as though they were file-like in
nature. It also means we get test coverage more or less for free. A
previous version of this change didn't use io.BytesIO, and it was a
lot more complicated.
This also fixes a server-side bug, so anyone using httppostargs should
update all of their servers to this revision or later *before* this
gets to their clients, otherwise servers will hang trying to over-read
the POST body.
Differential Revision: https://phab.mercurial-scm.org/D231
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