Back out the addition of bogus 'if __name__=="__main__"' block; the One

Obvious Way to test setuptools is to run 'setup.py test', because that also
provides an integration test for the 'test' command.

--HG--
branch : setuptools
extra : convert_revision : svn%3A6015fed2-1504-0410-9fe1-9d1591cc4771/sandbox/trunk/setuptools%4040998