tools: delete legacy nfdc and nfd-status invocations

The following legacy nfdc sub-commands are deleted:
- register
- unregister
- create
- destroy
- set-strategy
- unset-strategy
- add-nexthop
- remove nexthop

nfd-status no longer accepts command line arguments.

refs #4198

Change-Id: I3ec61fd24c09599c87f07bd92d8f0b5f4e7c70de
diff --git a/tools/nfdc/command-parser.cpp b/tools/nfdc/command-parser.cpp
index b4c4558..74c5202 100644
--- a/tools/nfdc/command-parser.cpp
+++ b/tools/nfdc/command-parser.cpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
-/**
- * Copyright (c) 2014-2016,  Regents of the University of California,
+/*
+ * Copyright (c) 2014-2017,  Regents of the University of California,
  *                           Arizona Board of Regents,
  *                           Colorado State University,
  *                           University Pierre & Marie Curie, Sorbonne University,
@@ -120,7 +120,7 @@
       i = m_commands.find({noun, "list"});
     }
     else {
-      // help, exit, quit, legacy nfdc commands
+      // help, exit, quit commands
       i = m_commands.find({noun, ""});
     }
     nameLen = std::min<size_t>(1, tokens.size());