Remove unused imports and definitions of True/False.

lib/python/BDBStorage/BerkeleyBase.py

@@ -43,12 +43,6 @@ GBYTES = 1024 * 1024 * 1000
 # better to shutdown cleanly.
 JOIN_TIME = 10
 
-try:
-    True, False
-except NameError:
-    True = 1
-    False = 0
-
 
 
 class PackStop(Exception):

lib/python/BDBStorage/tests/BerkeleyTestBase.py

@@ -16,7 +16,6 @@
 # Berkeley storages
 
 import os
-import errno
 import shutil
 import sys
 import unittest

lib/python/BDBStorage/tests/ZODBTestBase.py

@@ -15,7 +15,6 @@
 # Base class for unit tests at the ZODB layer
 
 import os
-import errno
 
 from ZODB import DB
 from BDBStorage.tests.BerkeleyTestBase import BerkeleyTestBase