'Both env.key_filename + valid ssh_config = both show up w/ env var first'

def test_both(self):

    with settings(use_ssh_config=True, ssh_config_path=support('ssh_config')):
        with settings(key_filename='bizbaz.pub'):
            eq_(key_filenames(), ['bizbaz.pub', 'foobar.pub'])
        with settings(key_filename=['bizbaz.pub', 'whatever.pub']):
            expected = ['bizbaz.pub', 'whatever.pub', 'foobar.pub']
            eq_(key_filenames(), expected)
