Update project/service config references.

logdog/api/config/svcconfig/util.go

 // Copyright 2016 The LUCI Authors. All rights reserved.
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
 package svcconfig
 
+import (
+        "fmt"
+)
+
 const (
-        // ServiceConfigFilename is the config service path of the Config protobuf.
-        ServiceConfigFilename = "services.cfg"
+        // ServiceConfigPath is the config service path of the Config protobuf.
+        ServiceConfigPath = "services.cfg"
 )
+
+// ProjectConfigPath returns the path of a LogDog project config given the
+// LogDog service's name.
+func ProjectConfigPath(serviceName string) string { return fmt.Sprintf("%s.cfg", serviceName) }