pylint fixes

sugar/presence/PresenceService.py

@@ -2,11 +2,8 @@ import threading
 import avahi, dbus, dbus.glib, dbus.dbus_bindings, gobject
 import Buddy
 import Service
-import os
-import string
 import random
 import logging
-from sugar import util
 from sugar import env
 
 def _get_local_ip_address(ifname):

sugar/presence/Service.py

@@ -1,6 +1,5 @@
 import avahi
 from sugar import util
-import string
 import dbus
 
 def _txt_to_dict(txt):