Return the hardware address (a.k.a. MAC address) for a given interface

    .. versionchanged:: 2016.11.4
        Added support for AIX

def hw_addr(iface):
    '''
    Return the hardware address (a.k.a. MAC address) for a given interface

    .. versionchanged:: 2016.11.4
        Added support for AIX

    '''
    if salt.utils.platform.is_aix():
        return _hw_addr_aix

    iface_info, error = _get_iface_info(iface)

    if error is False:
        return iface_info.get(iface, {}).get('hwaddr', '')
    else:
        return error