Issue #9051: Added tests for pickling and copying the timezone objects.

diff --cc Lib/test/datetimetester.py
index 63c3ae84bdf9549029de8648773cf8041770a293,289b0ca182007d6f45a506d2b0bb98eb97bedd52..6365c605791f12e2898a5c2c0b87078423a725c0
--- 1/Lib/test/datetimetester.py
--- 2/Lib/test/datetimetester.py
+++ b/Lib/test/datetimetester.py
@@@ -3,7 -3,7 +3,8 @@@
  See http://www.zope.org/Members/fdrake/DateTimeWiki/TestCases
  """
  
+ import copy
 +import decimal
  import sys
  import pickle
  import random