TUN-6666: Define packet package

This package defines IP and ICMP packet, decoders, encoder and flow

vendor/github.com/google/gopacket/.travis.govet.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+
+cd "$(dirname $0)"
+DIRS=". layers pcap pcapgo tcpassembly tcpassembly/tcpreader routing ip4defrag bytediff macs defrag/lcmdefrag"
+set -e
+for subdir in $DIRS; do
+  pushd $subdir
+  go vet
+  popd
+done