security: move {Rsa,Ec,Aes}KeyParamsInfo into namespace detail

Change-Id: I06fb1f7dfc809551c5533a185ada1b8dce8ee03e
diff --git a/tests/unit-tests/security/key-params.t.cpp b/tests/unit-tests/security/key-params.t.cpp
index 8903e46..46dea97 100644
--- a/tests/unit-tests/security/key-params.t.cpp
+++ b/tests/unit-tests/security/key-params.t.cpp
@@ -1,5 +1,5 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
-/**
+/*
  * Copyright (c) 2013-2017 Regents of the University of California.
  *
  * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
@@ -115,7 +115,6 @@
   BOOST_CHECK_EQUAL(boost::lexical_cast<std::string>(static_cast<KeyIdType>(12345)), "12345");
 }
 
-
 BOOST_AUTO_TEST_SUITE_END() // TestKeyParams
 BOOST_AUTO_TEST_SUITE_END() // Security