refactor! move RateLimitExceeded to roundup.cgi.exceptions - test

forgot to commit the change to the test as well

Author: rouilj

test/test_actions.py

@@ -5,8 +5,8 @@
 from roundup.date import Date, Interval
 from roundup.cgi.actions import *
 from roundup.cgi.client import add_message
-from roundup.cgi.exceptions import Redirect, Unauthorised, SeriousError, FormError
-from roundup.exceptions import RateLimitExceeded, Reject
+from roundup.cgi.exceptions import RateLimitExceeded, Redirect, Unauthorised, SeriousError, FormError
+from roundup.exceptions import Reject
 
 from roundup.anypy.cgi_ import FieldStorage, MiniFieldStorage
 from roundup.anypy.cmp_ import NoneAndDictComparable