Make obj.uncacheable available in vcl_deliver

With this is possible to find out whether the request was a pass (or
hit-for-pass) in a single place.

bin/varnishtest/tests/v00025.vtc

@@ -22,6 +22,7 @@ varnish v1 -arg "-i J.F.Nobody" -vcl+backend {
 		set resp.http.esi = req.esi;
 		set resp.http.be = req.backend_hint;
 		set resp.http.c_id = client.identity;
+		if (obj.uncacheable) { }
 	}
 
 	sub vcl_backend_response {
@@ -41,7 +42,6 @@ varnish v1 -arg "-i J.F.Nobody" -vcl+backend {
 	sub vcl_hit {
 		if (obj.proto) { }
 		if (obj.reason) { }
-		if (obj.uncacheable) { }
 		if (obj.keep > 1m) { }
 		if (obj.grace < 3m) {
 			return (deliver);

lib/libvcc/generate.py

@@ -605,9 +605,9 @@ sp_variables = [
 	),
 	('obj.uncacheable',
 		'BOOL',
-		( 'hit', ),
+		( 'deliver', ),
 		( ), """
-		Whether the object is uncacheable (aka hit-for-pass)
+		Whether the object is uncacheable (pass or hit-for-pass).
 		"""
 	),
 	('resp',