Changed import order

These changes close the lintian warning C0411.

offlineimap/repository/Maildir.py

@@ -15,12 +15,12 @@
 #    along with this program; if not, write to the Free Software
 #    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
 from offlineimap.repository.Base import BaseRepository
-import os
-from stat import *
 
 
 class MaildirRepository(BaseRepository):