Don't mess with X-forwarded-for on restarts.

Fixes: #758



git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@5113 d4fa192b-c00b-0410-8231-f00ffab90ce4

bin/varnishd/default.vcl

@@ -40,11 +40,13 @@
  */
 
 sub vcl_recv {
-    if (req.http.x-forwarded-for) {
-	set req.http.X-Forwarded-For =
-	    req.http.X-Forwarded-For ", " client.ip;
-    } else {
-	set req.http.X-Forwarded-For = client.ip;
+    if (req.restarts == 0) {
+	if (req.http.x-forwarded-for) {
+	    set req.http.X-Forwarded-For =
+		req.http.X-Forwarded-For ", " client.ip;
+	} else {
+	    set req.http.X-Forwarded-For = client.ip;
+	}
     }
     if (req.request != "GET" &&
       req.request != "HEAD" &&