tests: test IP transports under various combos of address family/scope

In particular, link-local addresses are now tested as well.

Additionally, WebSocketTransport send/receive tests are extended
to check transport counters.

Change-Id: I5b35f498a5d8d70cb1f7a2bea3ce99d22370e050
Refs: #1428
diff --git a/tests/daemon/face/test-netif.hpp b/tests/daemon/face/test-netif.hpp
new file mode 100644
index 0000000..d30d865
--- /dev/null
+++ b/tests/daemon/face/test-netif.hpp
@@ -0,0 +1,53 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2014-2017,  Regents of the University of California,
+ *                           Arizona Board of Regents,
+ *                           Colorado State University,
+ *                           University Pierre & Marie Curie, Sorbonne University,
+ *                           Washington University in St. Louis,
+ *                           Beijing Institute of Technology,
+ *                           The University of Memphis.
+ *
+ * This file is part of NFD (Named Data Networking Forwarding Daemon).
+ * See AUTHORS.md for complete list of NFD authors and contributors.
+ *
+ * NFD is free software: you can redistribute it and/or modify it under the terms
+ * of the GNU General Public License as published by the Free Software Foundation,
+ * either version 3 of the License, or (at your option) any later version.
+ *
+ * NFD 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * NFD, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef NFD_TESTS_DAEMON_FACE_TEST_NETIF_HPP
+#define NFD_TESTS_DAEMON_FACE_TEST_NETIF_HPP
+
+#include "core/common.hpp"
+
+#include <ndn-cxx/net/network-address.hpp>
+#include <ndn-cxx/net/network-interface.hpp>
+
+namespace nfd {
+namespace face {
+namespace tests {
+
+using ndn::net::NetworkAddress;
+using ndn::net::NetworkInterface;
+
+/** \brief Collect information about network interfaces
+ *  \param allowCached if true, previously collected information can be returned
+ *  \note This function is blocking if \p allowCached is false or no previous information exists
+ *  \throw ndn::net::NetworkMonitor::Error NetworkMonitor::CAP_ENUM is unavailable
+ */
+std::vector<shared_ptr<const NetworkInterface>>
+collectNetworkInterfaces(bool allowCached = true);
+
+} // namespace tests
+} // namespace face
+} // namespace nfd
+
+#endif // NFD_TESTS_DAEMON_FACE_TEST_NETIF_HPP