fix init_user_mapping/init_group_mapping bitrot

git-svn-id: http://svn.savannah.nongnu.org/svn/rdiff-backup@589 2b77aa54-bcbc-44c9-a7ec-4f6cf2b41109

trunk/rdiff-backup/testing/backuptest.py

 import unittest
 from commontest import *
-from rdiff_backup import Globals, SetConnections
+from rdiff_backup import Globals, SetConnections, user_group
 
 class RemoteMirrorTest(unittest.TestCase):
 	"""Test mirroring"""
@@ -9,6 +9,8 @@ class RemoteMirrorTest(unittest.TestCase):
 		Log.setverbosity(3)
 		Globals.change_source_perms = 1
 		SetConnections.UpdateGlobal('checkpoint_interval', 3)
+		user_group.init_user_mapping()
+		user_group.init_group_mapping()
 
 	def testMirror(self):
 		"""Testing simple mirror"""