update netcfg to use prefixLength not netmask

int dump_interface(const char *name)

{

    unsigned addr, mask, flags;

    unsigned addr, prefixLength, flags;

    unsigned char hwbuf[ETH_ALEN];

    if(ifc_get_info(name, &addr, &mask, &flags)) {

    if(ifc_get_info(name, &addr, &prefixLength, &flags)) {

        return 0;

    }

    printf("%-8s %s  ", name, flags & 1 ? "UP  " : "DOWN");

    printf("%-16s", ipaddr(addr));

    printf("%-16s", ipaddr(mask));

    printf("%40s", ipaddr(addr));

    printf("/%-4d", prefixLength);

    printf("0x%08x ", flags);

    if (!ifc_get_hwaddr(name, hwbuf)) {

        int i;