tests: UnicastUdpTransport test suite improvements

Fixed m_hasBeenUsedRecently uninitialized in DatagramTransport

refs #3307

Change-Id: I786a84009d9cf01e0bb211c872d4375f46c747fd
diff --git a/tests/daemon/face/unix-stream-transport.t.cpp b/tests/daemon/face/unix-stream-transport.t.cpp
index 2ff73be..8042042 100644
--- a/tests/daemon/face/unix-stream-transport.t.cpp
+++ b/tests/daemon/face/unix-stream-transport.t.cpp
@@ -23,6 +23,8 @@
  * NFD, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include "transport-test-common.hpp"
+
 #include "unix-stream-transport-fixture.hpp"
 
 namespace nfd {
@@ -30,7 +32,6 @@
 namespace tests {
 
 BOOST_AUTO_TEST_SUITE(Face)
-
 BOOST_FIXTURE_TEST_SUITE(TestUnixStreamTransport, UnixStreamTransportFixture)
 
 BOOST_AUTO_TEST_CASE(StaticProperties)