tools: rename autoconfig Base to Stage

Also, turn BaseDns into non-member functions.

refs #4158

Change-Id: Id3ab862497a07cc261ed34b2ab116f4014a4c6fa
diff --git a/tools/ndn-autoconfig/guess-from-search-domains.hpp b/tools/ndn-autoconfig/guess-from-search-domains.hpp
index bcfd4c8..a2670ec 100644
--- a/tools/ndn-autoconfig/guess-from-search-domains.hpp
+++ b/tools/ndn-autoconfig/guess-from-search-domains.hpp
@@ -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,
@@ -26,7 +26,7 @@
 #ifndef NFD_TOOLS_NDN_AUTOCONFIG_GUESS_FROM_SEARCH_DOMAINS_HPP
 #define NFD_TOOLS_NDN_AUTOCONFIG_GUESS_FROM_SEARCH_DOMAINS_HPP
 
-#include "base-dns.hpp"
+#include "stage.hpp"
 
 namespace ndn {
 namespace tools {
@@ -46,17 +46,16 @@
  *     The DNS server should answer with an SRV record that contains the hostname and UDP port
  *     number of the NDN router.
  */
-class GuessFromSearchDomains : public BaseDns
+class GuessFromSearchDomains : public Stage
 {
 public:
   /**
    * @brief Create stage to guess home router based on DNS query with default suffix
-   * @sa Base::Base
    */
   GuessFromSearchDomains(Face& face, KeyChain& keyChain,
                          const NextStageCallback& nextStageOnFailure);
 
-  virtual void
+  void
   start() override;
 };
 
@@ -64,4 +63,4 @@
 } // namespace tools
 } // namespace ndn
 
-#endif // NFD_TOOLS_NDN_AUTOCONFIG_GUESSING_FROM_SEARCH_DOMAINS_HPP
+#endif // NFD_TOOLS_NDN_AUTOCONFIG_GUESS_FROM_SEARCH_DOMAINS_HPP