cleanup import satements

- conform to PEP8
- explicitly define symbols instead of 'import *'
- remove unused import

Reviewed-by: Sebastian Spaeth <Sebastian@SSpaeth.de>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>

offlineimap/ui/TTY.py

@@ -19,7 +19,7 @@
 from UIBase import UIBase
 from getpass import getpass
 import sys
-from threading import *
+from threading import Lock, currentThread
 
 class TTYUI(UIBase):
     def __init__(s, config, verbose = 0):