Remove 'import *' statement from xmlrpc.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/xmlrpc.py

@@ -5,11 +5,10 @@
 #
 
 from roundup import hyperdb
-from roundup.cgi.exceptions import *
-from roundup.exceptions import UsageError
+from roundup.exceptions import Unauthorised, UsageError
 from roundup.date import Date, Range, Interval
 from roundup import actions
-from SimpleXMLRPCServer import *
+from SimpleXMLRPCServer import SimpleXMLRPCDispatcher
 from xmlrpclib import Binary
 
 def translate(value):