do not disclose proxy user and password in debug messages

mercurial/httprepo.py

@@ -165,7 +165,8 b' class httprepository(remoterepository):'
                                                proxyuser, proxypasswd or ''),
                     proxypath, proxyquery, proxyfrag))
                 handler = urllib2.ProxyHandler({scheme: proxyurl})
-                ui.debug(_('proxying through %s\n') % proxyurl)
+                ui.debug(_('proxying through http://%s:%s\n') % 
+                          (proxyhost, proxyport))
 
         # urllib2 takes proxy values from the environment and those
         # will take precedence if found, so drop them