Vendor new queue-worker version

Introduces 0.4.6 of queue-worker - see upstream repo for changes.

Signed-off-by: Alex Ellis (VMware) <alexellis2@gmail.com>

gateway/vendor/github.com/nats-io/go-nats/test/helper_test.go

@@ -1,10 +1,23 @@
-// Copyright 2015 Apcera Inc. All rights reserved.
+// Copyright 2015-2018 The NATS Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
 
 package test
 
 import (
 	"errors"
 	"fmt"
+	"runtime"
+	"strings"
 	"time"
 
 	"github.com/nats-io/gnatsd/server"
@@ -37,6 +50,23 @@ func WaitTime(ch chan bool, timeout time.Duration) error {
 	return errors.New("timeout")
 }
 
+func stackFatalf(t tLogger, f string, args ...interface{}) {
+	lines := make([]string, 0, 32)
+	msg := fmt.Sprintf(f, args...)
+	lines = append(lines, msg)
+
+	// Generate the Stack of callers: Skip us and verify* frames.
+	for i := 1; true; i++ {
+		_, file, line, ok := runtime.Caller(i)
+		if !ok {
+			break
+		}
+		msg := fmt.Sprintf("%d - %s:%d", i, file, line)
+		lines = append(lines, msg)
+	}
+	t.Fatalf("%s", strings.Join(lines, "\n"))
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // Creating client connections
 ////////////////////////////////////////////////////////////////////////////////