security: Move KeyChain to security::v1 namespace and deprecated it

Change-Id: Ic4b6915ca15998a83b410f3f8fac027f797ee7ca
Refs: #3098
diff --git a/src/mgmt/dispatcher.cpp b/src/mgmt/dispatcher.cpp
index a7f4a06..a7fac52 100644
--- a/src/mgmt/dispatcher.cpp
+++ b/src/mgmt/dispatcher.cpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /**
- * Copyright (c) 2013-2016 Regents of the University of California.
+ * Copyright (c) 2013-2017 Regents of the University of California.
  *
  * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
  *
@@ -44,7 +44,7 @@
   };
 }
 
-Dispatcher::Dispatcher(Face& face, security::KeyChain& keyChain,
+Dispatcher::Dispatcher(Face& face, security::v1::KeyChain& keyChain,
                        const security::SigningInfo& signingInfo,
                        size_t imsCapacity)
   : m_face(face)