Req.hash_always_miss now implies req.hash_ignore_busy.

Fixes a case where we might get a cache hit even though hash_always_miss is set.

Fixes: #1073

bin/varnishd/cache_hash.c

@@ -352,7 +352,7 @@ HSH_Lookup(struct sess *sp, struct objhead **poh)
 
 		if (oc->flags & OC_F_BUSY) {
 			CHECK_OBJ_NOTNULL(oc->busyobj, BUSYOBJ_MAGIC);
-			if (sp->hash_ignore_busy)
+			if (sp->hash_ignore_busy || sp->hash_always_miss)
 				continue;
 
 			if (oc->busyobj->vary != NULL &&

bin/varnishtest/tests/r01073.vtc

@@ -0,0 +1,55 @@
+varnishtest "Test that hash_always_miss also implies hash_ignore_busy. Ticket #1073."
+
+server s1 {
+	rxreq 
+	sema r1 sync 2
+	sema r2 sync 2
+	delay 1
+	txresp -hdr "Server: 1"
+} -start
+
+server s2 {
+	rxreq
+	sema r2 sync 2
+	txresp -hdr "Server: 2"
+} -start
+
+varnish v1 -vcl+backend { 
+	sub vcl_recv {
+		if (req.http.x-hash-always-miss == "1") {
+			set req.hash_always_miss = true;
+		}
+		if (req.http.x-client == "1") {
+			set req.backend = s1;
+		}
+		if (req.http.x-client == "2") {
+			set req.backend = s2;
+		}
+	}
+	sub vcl_deliver {
+		if(obj.hits > 0) {
+			set resp.http.X-Cache = "HIT";
+		} else {
+			set resp.http.X-Cache = "MISS";
+		}
+	}
+} -start 
+
+client c1 {
+	txreq -url "/" -hdr "x-client: 1"
+	rxresp
+	expect resp.status == 200
+	expect resp.http.Server == "1"
+} -start
+
+client c2 {
+    sema r1 sync 2
+	txreq -url "/" -hdr "x-client: 2" -hdr "x-hash-always-miss: 1"
+	txreq -url "/" -hdr "x-client: 2"
+	rxresp
+	expect resp.status == 200
+	expect resp.http.Server == "2"
+} -start
+
+client c1 -wait
+client c2 -wait