hgweb: escape REMOTE_HOST when passing url for addchangegroup

If DNS lookups are turned off on the web server, REMOTE_HOST may be
populated with REMOTE_ADDR, which, if the remote is an IPv6 hosts will
contain colons, thus interfering with the separator character. This is
solved by URL quoting the REMOTE_HOST string.

mercurial/hgweb/protocol.py

@@ -163,7 +163,8 b' def unbundle(repo, req):'
 
                 try:
                     url = 'remote:%s:%s' % (proto,
-                                            req.env.get('REMOTE_HOST', ''))
+                                            urllib.quote(
+                                              req.env.get('REMOTE_HOST', '')))
                     try:
                         ret = repo.addchangegroup(gen, 'serve', url)
                     except util.Abort, inst: