fix undefined variables, spotted by pylint

mercurial/dagparser.py

@@ -7,6 +7,7 b''
 
 import re, string
 import util
+from i18n import _
 
 def parsedag(desc):
     '''parses a DAG from a concise textual description; generates events

mercurial/wireproto.py

@@ -5,7 +5,7 b''
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2 or any later version.
 
-import urllib, tempfile, os
+import urllib, tempfile, os, sys
 from i18n import _
 from node import bin, hex
 import changegroup as changegroupmod
@@ -36,7 +36,7 b' class wirerepository(repo.repository):'
         try:
             return decodelist(d[:-1])
         except:
-            self.abort(error.ResponseError(_("unexpected response:"), d))
+            self._abort(error.ResponseError(_("unexpected response:"), d))
 
     def branchmap(self):
         d = self._call("branchmap")