face: Implementing Face::getUri() method

Change-Id: I9a9f774b95784e5b7ec75472f1cc6cf64c4e5d7b
Refs: #1319
diff --git a/daemon/mgmt/internal-face.cpp b/daemon/mgmt/internal-face.cpp
index a6c116b..f7e5018 100644
--- a/daemon/mgmt/internal-face.cpp
+++ b/daemon/mgmt/internal-face.cpp
@@ -11,7 +11,7 @@
 NFD_LOG_INIT("InternalFace");
 
 InternalFace::InternalFace()
-  : Face(true)
+  : Face(FaceUri("internal://"), true)
 {
 }