first attempt for fuzzing

protocols/bgp/packet/fuzzing.go

+// +build gofuzz
+
+package packet
+
+import "bytes"
+
+const (
+	INC_PRIO = 1
+	KEEP     = 0
+	DISMISS  = -1
+)
+
+func Fuzz(data []byte) int {
+
+	buf := bytes.NewBuffer(data)
+	msg, err := Decode(buf)
+	if err != nil {
+		if msg != nil {
+			panic("msg != nil on error")
+		}
+		return KEEP
+	}
+
+	return INC_PRIO
+}