Only look at client requests in varnishhist.

Without the -b -c options enabled, looking at backend requests becomes
ill-defined. Disable anything but non-esi client requests for
now. This can be extended in the future.

bin/varnishhist/varnishhist.c

@@ -199,10 +199,14 @@ accumulate(struct VSL_data *vsl, struct VSL_transaction * const pt[],
 	(void)priv;
 
 	for (tr = pt[0]; tr != NULL; tr = *++pt) {
+		if (tr->type != VSL_t_req)
+			/* Only look at client requests */
+			continue;
+		if (tr->reason == VSL_r_esi)
+			/* Skip ESI requests */
+			continue;
 		value = -1;
 		hit = 0;
-		if (tr->type != VSL_t_bereq && tr->type != VSL_t_req)
-			continue;
 		while ((1 == VSL_Next(tr->c))) {
 			/* get the value we want, and register if it's a hit*/
 			tag = VSL_TAG(tr->c->rec.ptr);