Give busyobj a copy of the hash-key so directors can access it.

(VDD14q3 item)

bin/varnishd/cache/cache.h

@@ -517,6 +517,8 @@ struct busyobj {
 	struct vsl_log		vsl[1];
 
 	struct vsb		*synth_body;
+
+	uint8_t			digest[DIGEST_LEN];
 };
 
 

bin/varnishd/cache/cache_busyobj.c

@@ -151,6 +151,8 @@ VBO_GetBusyObj(struct worker *wrk, const struct req *req)
 	bo->t_first = bo->t_prev = NAN;
 	bo->doclose = SC_NULL;
 
+	memcpy(bo->digest, req->digest, sizeof bo->digest);
+
 	return (bo);
 }