update email tests to use SkipTest

Lib/email/test/test_email_codecs.py

@@ -3,7 +3,7 @@
 # email package unit tests for (optional) Asian codecs
 
 import unittest
-from test.test_support import TestSkipped, run_unittest
+from test.test_support import run_unittest
 
 from email.test.test_email import TestEmailBase
 from email.Charset import Charset
@@ -15,7 +15,7 @@ from email.Message import Message
 try:
     unicode('foo', 'euc-jp')
 except LookupError:
-    raise TestSkipped
+    raise unittest.SkipTest