Internal, creates the bridge

def _bsd_bradd(br):
    '''
    Internal, creates the bridge
    '''
    kernel = __grains__['kernel']
    ifconfig = _tool_path('ifconfig')

    if not br:
        return False

    if __salt__['cmd.retcode']('{0} {1} create up'.format(ifconfig, br),
                               python_shell=False) != 0:
        return False

    # NetBSD is two cmds
    if kernel == 'NetBSD':
        brconfig = _tool_path('brconfig')
        if __salt__['cmd.retcode']('{0} {1} up'.format(brconfig, br),
                                   python_shell=False) != 0:
            return False

    return True