Add test_main() functions to various tests where it was simple to do. Done so

that regrtest can execute the test_main() directly instead of relying on import
side-effects.

Lib/test/test_cl.py

@@ -66,7 +66,7 @@ clattrs = ['ADDED_ALGORITHM_ERROR', 'ALAW', 'ALGORITHM_ID',
 # This is a very inobtrusive test for the existence of the cl
 # module and all its attributes.
 
-def main():
+def test_main():
     # touch all the attributes of al without doing anything
     if verbose:
         print 'Touching cl module attributes...'
@@ -75,4 +75,7 @@ def main():
             print 'touching: ', attr
         getattr(cl, attr)
 
-main()
+
+
+if __name__ == '__main__':
+    test_main()