Remove 'import *' statement from actions.py

There are various 'import *' statements scattered through the code which
are generally not a good thing. These should be fairly safe changes, but
I'll commit them one file at a time to make it easier to track down
issues with a bisect if they crop up later.

Author: jerrykan

roundup/actions.py

@@ -4,7 +4,7 @@
 # For license terms see the file COPYING.txt.
 #
 
-from roundup.exceptions import *
+from roundup.exceptions import Unauthorised
 from roundup import hyperdb
 from roundup.i18n import _