Add import_function method to test.test_support, and modify a number of
tests that expect to be skipped if imports fail or functions don't
exist to use import_function and import_module.  The ultimate goal is
to change regrtest to not skip automatically on ImportError.  Checking
in now to make sure the buldbots don't show any errors on platforms
I can't direct test on.
diff --git a/Lib/test/test_pwd.py b/Lib/test/test_pwd.py
index 255a34c..de4084e 100644
--- a/Lib/test/test_pwd.py
+++ b/Lib/test/test_pwd.py
@@ -1,7 +1,7 @@
 import unittest
 from test import test_support
 
-import pwd
+pwd = test_support.import_module('pwd')
 
 class PwdTest(unittest.TestCase):