Get the output volume (range 0 to 100)

    CLI Example:

    .. code-block:: bash

        salt '*' desktop.get_output_volume

def get_output_volume():
    '''
    Get the output volume (range 0 to 100)

    CLI Example:

    .. code-block:: bash

        salt '*' desktop.get_output_volume
    '''
    cmd = 'osascript -e "get output volume of (get volume settings)"'
    call = __salt__['cmd.run_all'](
        cmd,
        output_loglevel='debug',
        python_shell=False
    )
    _check_cmd(call)

    return call.get('stdout')