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convert: allow the sink object to be wrapped when the extension isn't loaded

The next patch will wrap the conversion code, in order to write out a
requirement for 'lfs' when appropriate.  Wrapping convcmd.convertsink() in an
afterloaded callback works fine when the convert extension is enabled by the
user.  The problem here is that lfconvert uses the convert extension, whether or
not it was formally enabled by the user.

My first attempt was to have lfs install an afterloaded callback that would wrap
the convert sink if convert was loaded, or wrap lfconvert if it wasn't.  Then
the lfconvert override could install an afterloaded callback to try wrapping the
convert sink again, before calling the original lfconvert.  But that breaks down
if largefiles can't load the convert extension on the fly. [1]  Further, some
tests were failing with an error indicating that the size of the afterloaded
list changed while iterating it.

Yuya mentioned that maybe some bits of convert could be moved into core, but I'm
not sure where to draw that line.  The convertsink() method depends on the list
of sinks, which in turn depends on the sink classes.

[1] https://www.mercurial-scm.org/pipermail/mercurial-devel/2017-November/108038.html

#!/usr/bin/env python
#
# An example hgweb CGI script, edit as necessary
# See also https://mercurial-scm.org/wiki/PublishingRepositories

# Path to repo or hgweb config to serve (see 'hg help hgweb')
config = "/path/to/repo/or/config"

# Uncomment and adjust if Mercurial is not installed system-wide
# (consult "installed modules" path from 'hg debuginstall'):
#import sys; sys.path.insert(0, "/path/to/python/lib")

# Uncomment to send python tracebacks to the browser if an error occurs:
#import cgitb; cgitb.enable()

from mercurial import demandimport; demandimport.enable()
from mercurial.hgweb import hgweb, wsgicgi
application = hgweb(config)
wsgicgi.launch(application)