py3: adapt test-largefiles-wireproto.t to python3

contrib/python3-whitelist

@@ -305,6 +305,7 b' test-largefiles-cache.t'
 test-largefiles-misc.t
 test-largefiles-small-disk.t
 test-largefiles-update.t
+test-largefiles-wireproto.t
 test-largefiles.t
 test-lfconvert.t
 test-lfs-bundle.t

tests/test-largefiles-wireproto.t

@@ -240,10 +240,10 b' Clone over http, no largefiles pulled on'
 
 Archive contains largefiles
   >>> import os
-  >>> import urllib2
+  >>> from mercurial import urllibcompat
   >>> u = 'http://localhost:%s/archive/default.zip' % os.environ['HGPORT2']
-  >>> with open('archive.zip', 'w') as f:
-  ...     f.write(urllib2.urlopen(u).read()) and None
+  >>> with open('archive.zip', 'wb') as f:
+  ...     f.write(urllibcompat.urlreq.urlopen(u).read()) and None
   $ unzip -t archive.zip
   Archive:  archive.zip
       testing: empty-default/.hg_archival.txt*OK (glob)