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/daemon/fw/client-control-strategy.cpp b/daemon/fw/client-control-strategy.cpp
index 7cc07fd..1066efa 100644
--- a/daemon/fw/client-control-strategy.cpp
+++ b/daemon/fw/client-control-strategy.cpp
@@ -58,7 +58,7 @@
 
   FaceId outFaceId = static_cast<FaceId>(*tag);
   shared_ptr<Face> outFace = this->getFace(outFaceId);
-  if (!static_cast<bool>(outFace)) {
+  if (outFace == nullptr) {
     // If outFace doesn't exist, it's better to reject the Interest
     // than to use BestRouteStrategy.
     NFD_LOG_WARN("Interest " << interest.getName() <<