Change more tests to use import_module for the modules that
should cause tests to be skipped.  Also rename import_function
to the more descriptive get_attribute and add a docstring.
diff --git a/Lib/test/test_ossaudiodev.py b/Lib/test/test_ossaudiodev.py
index ddee6db..34893f1 100644
--- a/Lib/test/test_ossaudiodev.py
+++ b/Lib/test/test_ossaudiodev.py
@@ -3,8 +3,9 @@
 
 from test.test_support import findfile
 
+ossaudiodev = test_support.import_module('ossaudiodev')
+
 import errno
-import ossaudiodev
 import sys
 import sunau
 import time