Displays whether 'allow power button to sleep computer' is on or off if
    supported

    :return: A string value representing the "allow power button to sleep
        computer" settings

    :rtype: string

    CLI Example:

    .. code-block:: bash

        salt '*' power.get_sleep_on_power_button

def get_sleep_on_power_button():
    '''
    Displays whether 'allow power button to sleep computer' is on or off if
    supported

    :return: A string value representing the "allow power button to sleep
        computer" settings

    :rtype: string

    CLI Example:

    .. code-block:: bash

        salt '*' power.get_sleep_on_power_button
    '''
    ret = salt.utils.mac_utils.execute_return_result(
        'systemsetup -getallowpowerbuttontosleepcomputer')
    return salt.utils.mac_utils.validate_enabled(
            salt.utils.mac_utils.parse_return(ret)) == 'on'