Provide a dict of the connected interfaces and their
    hw addresses (Mac Address)

def hwaddr_interfaces():
    '''
    Provide a dict of the connected interfaces and their
    hw addresses (Mac Address)
    '''
    # Provides:
    #   hwaddr_interfaces
    ret = {}
    ifaces = _get_interfaces()
    for face in ifaces:
        if 'hwaddr' in ifaces[face]:
            ret[face] = ifaces[face]['hwaddr']
    return {'hwaddr_interfaces': ret}