face: Make default transport configurable

This commit also removes support for the ndnd-tlv-0.7
protocol's default socket location from UnixTransport.

Test HOME environment changing has also been centralized
into a single fixture (util/test-home-environment-fixture.hpp)

refs #2189

Change-Id: Iac1a6c88d7a2d9fcfb91a20356ac21b75daf7d17
diff --git a/tests/unit-tests/transport/transport-fixture.hpp b/tests/unit-tests/transport/transport-fixture.hpp
new file mode 100644
index 0000000..71970c5
--- /dev/null
+++ b/tests/unit-tests/transport/transport-fixture.hpp
@@ -0,0 +1,48 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2013-2014 Regents of the University of California.
+ *
+ * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
+ *
+ * ndn-cxx library is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU Lesser General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later version.
+ *
+ * ndn-cxx library is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+ * PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more details.
+ *
+ * You should have received copies of the GNU General Public License and GNU Lesser
+ * General Public License along with ndn-cxx, e.g., in COPYING.md file.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * See AUTHORS.md for complete list of ndn-cxx authors and contributors.
+ */
+
+#include "util/config-file.hpp"
+#include "../util/test-home-environment-fixture.hpp"
+
+#ifndef NDN_TESTS_UNIT_TESTS_TRANSPORT_FIXTURE_HPP
+#define NDN_TESTS_UNIT_TESTS_TRANSPORT_FIXTURE_HPP
+
+namespace ndn {
+
+class TransportFixture : public util::TestHomeEnvironmentFixture
+{
+public:
+
+  void
+  initializeConfig(const char* path)
+  {
+    setenv("TEST_HOME", path, 1);
+    m_config.reset(new ConfigFile);
+  }
+
+protected:
+  std::string m_HOME;
+  unique_ptr<ConfigFile> m_config;
+};
+
+} // namespace ndn
+
+#endif // NDN_TESTS_UNIT_TESTS_TRANSPORT_FIXTURE_HPP