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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def system_info(host=None,
                admin_username=None, admin_password=None,
                module=None):
    '''
    Return System information

    CLI Example:

    .. code-block:: bash

        salt dell dracr.system_info
    '''
    cmd = __execute_ret('getsysinfo', host=host,
                        admin_username=admin_username,
                        admin_password=admin_password,
                        module=module)

    if cmd['retcode'] != 0:
        log.warning('racadm returned an exit code of %s', cmd['retcode'])
        return cmd

    return __parse_drac(cmd['stdout'])