face: face refactoring completion

* delete old Face
* rename LpFace as Face
* eliminate LpFaceWrapper and use new Face

refs #3172

Change-Id: I08c3a5dfb4cc1b9834b30cccd9ab634535d0608c
diff --git a/tests/daemon/face/null-face.t.cpp b/tests/daemon/face/null-face.t.cpp
index 16d1a11..4075245 100644
--- a/tests/daemon/face/null-face.t.cpp
+++ b/tests/daemon/face/null-face.t.cpp
@@ -24,7 +24,7 @@
  */
 
 #include "face/null-face.hpp"
-#include "face/lp-face-wrapper.hpp"
+
 #include "transport-test-common.hpp"
 
 namespace nfd {
@@ -40,8 +40,7 @@
 
 BOOST_AUTO_TEST_CASE(StaticProperties)
 {
-  shared_ptr<Face> faceW = makeNullFace(FaceUri("testnull://hhppt12sy"));
-  LpFace* face = static_pointer_cast<LpFaceWrapper>(faceW)->getLpFace();
+  shared_ptr<Face> face = makeNullFace(FaceUri("testnull://hhppt12sy"));
   checkStaticPropertiesInitialized(*face->getTransport());
 
   BOOST_CHECK_EQUAL(face->getLocalUri(), FaceUri("testnull://hhppt12sy"));