management: add Flags and Mask fields to faces/create and faces/update

refs #3731

Change-Id: I35fb84a875767649da0cb354be5e5c07de179198
diff --git a/src/encoding/nfd-constants.hpp b/src/encoding/nfd-constants.hpp
index 671bd2c..4c38bd9 100644
--- a/src/encoding/nfd-constants.hpp
+++ b/src/encoding/nfd-constants.hpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /**
- * Copyright (c) 2013-2014 Regents of the University of California.
+ * Copyright (c) 2013-2016 Regents of the University of California.
  *
  * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
  *
@@ -64,6 +64,14 @@
 
 /** \ingroup management
  */
+enum FaceFlagBit {
+  /** \brief bit that controls whether local fields are enabled on a face
+   */
+  BIT_LOCAL_FIELDS_ENABLED = 0
+};
+
+/** \ingroup management
+ */
 enum LinkType : uint8_t {
   LINK_TYPE_NONE = std::numeric_limits<uint8_t>::max(),
   /** \brief link is point-to-point