Execute ssh-copy-id to plant the id file on the target

def copy_id(self):
        '''
        Execute ssh-copy-id to plant the id file on the target
        '''
        stdout, stderr, retcode = self._run_cmd(self._copy_id_str_old())
        if salt.defaults.exitcodes.EX_OK != retcode and 'Usage' in stderr:
            stdout, stderr, retcode = self._run_cmd(self._copy_id_str_new())
        return stdout, stderr, retcode