wireprotoserver: don't import symbol from hgweb.common

Importing hgweb.common requires importing hgweb.
hgweb/__init__.py contains a bit of code and does imports of large
parts of the hgweb.* module tree.

All we need is a constant defining the integer status code for
HTTP OK. So just redefine HTTP_OK in wireprotoserver.py and avoid
the excessive imports.

Differential Revision: https://phab.mercurial-scm.org/D1967

mercurial/wireprotoserver.py

@@ -9,9 +9,6 b' from __future__ import absolute_import'
 import cgi
 import struct
 
-from .hgweb.common import (
-    HTTP_OK,
-)
 from . import (
     error,
     pycompat,
@@ -24,6 +21,8 b' stringio = util.stringio'
 urlerr = util.urlerr
 urlreq = util.urlreq
 
+HTTP_OK = 200
+
 HGTYPE = 'application/mercurial-0.1'
 HGTYPE2 = 'application/mercurial-0.2'
 HGERRTYPE = 'application/hg-error'