Fix import of user_store in test.

tests/test_user_store.py

@@ -1,7 +1,7 @@
 #! /usr/bin/env python
 # -*- mode: python; mode: auto-fill; fill-column: 80 -*-
 
-import user_store
+import modules.user_store
 from logger import Logger
 import cfg
 import unittest
@@ -83,4 +83,4 @@ class UserStore(unittest.TestCase):
         return user
 
 if __name__ == "__main__":
-    unittest.main()
+    unittest.main()