Removed not used imports

This patch removes the import lines not used

offlineimap/imaputil.py

@@ -16,7 +16,6 @@
 #    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 
 import re
-import string
 import binascii
 import codecs
 from offlineimap.ui import getglobalui

offlineimap/localeval.py

@@ -18,11 +18,6 @@
 
 import imp
 
-try:
-    import errno
-except:
-    pass
-
 
 class LocalEval(object):
     """Here is a powerfull but very dangerous option, of course."""

offlineimap/repository/Maildir.py

@@ -16,7 +16,6 @@
 #    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 
 import os
-from stat import *
 from offlineimap import folder
 from offlineimap.ui import getglobalui
 from offlineimap.error import OfflineImapError