PF_PACKET domain socket support

[sunmingbao]

Could you implement PF_PACKET domain socke in dpdk-ans?
thanks very much!

Some user may wanna use PF_PACKET domain socket to receive or transmit original ethernet frames.
Bellow are the sample codes.

    int ret;
    struct sockaddr_ll sock_addr = {
        .sll_family = AF_PACKET,
        .sll_protocol = 0,
        .sll_ifindex =0
    };

    int fd = socket(AF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
   bind(fd, (struct sockaddr *)&sock_addr, sizeof(struct sockaddr_ll));

[bluenet13]

Will not support PF_PACKET because no much benefit for it.