xdp-tools: add dnsdist XDP program

upgrade xdp-tools to 1.5.5 and add dnsdist_xdp.bpf.o
for dnsdist xsk AF_XDP

xdp-loader load green0 -P 90 -p /sys/fs/bpf/dnsdist \
    -n xdp_dns_filter /usr/lib/bpf/dnsdist_xdp.bpf.o

Signed-off-by: Vincent Li <vincent.mc.li@gmail.com>

config/rootfiles/common/xdp-tools

@@ -7,6 +7,7 @@ usr/lib/bpf/xdp_dns.bpf.o
 usr/lib/bpf/xdp_sni.bpf.o
 usr/lib/bpf/xdp_geoip.bpf.o
 usr/lib/bpf/xdp_udpddos.bpf.o
+usr/lib/bpf/dnsdist_xdp.bpf.o
 usr/sbin/xdp-udp
 usr/sbin/xdp_dns
 etc/rc.d/rc3.d/S102xdpdns