Fix missing import.

Signed-off-by: Ewan Mellor <ewan@xensource.com>

tools/python/xen/util/xmlrpcclient.py

@@ -19,6 +19,7 @@
 
 from httplib import FakeSocket, HTTPConnection, HTTP
 import socket
+import string
 import xmlrpclib
 from types import StringTypes
 

tools/python/xen/util/xmlrpclib2.py

@@ -21,7 +21,6 @@ An enhanced XML-RPC client/server interface for Python.
 """
 
 import re
-import string
 import fcntl
 from types import *