Implement draft-ietf-dnsop-kskroll-sentinel-00

fixes: #266 (closed)

daemon/lua/kres-gen.lua

@@ -261,6 +261,7 @@ uint32_t kr_rand_uint(uint32_t);
 void kr_pkt_make_auth_header(knot_pkt_t *);
 int kr_pkt_put(knot_pkt_t *, const knot_dname_t *, uint32_t, uint16_t, uint16_t, const uint8_t *, uint16_t);
 int kr_pkt_recycle(knot_pkt_t *);
+int kr_pkt_clear_payload(knot_pkt_t *);
 const char *kr_inaddr(const struct sockaddr *);
 int kr_inaddr_family(const struct sockaddr *);
 int kr_inaddr_len(const struct sockaddr *);