make push over http print good error message.

make push over http print good error message.

--- a/mercurial/httprepo.py	Thu Mar 09 08:27:49 2006 +0100
+++ b/mercurial/httprepo.py	Thu Mar 09 12:18:59 2006 -0800
@@ -67,6 +67,9 @@
     def dev(self):
         return -1
 
+    def lock(self):
+        raise util.Abort(_('operation not supported over http'))
+
     def do_cmd(self, cmd, **args):
         self.ui.debug(_("sending %s command\n") % cmd)
         q = {"cmd": cmd}