face: Implementation of encode/decode of LocalControlHeader

LocalControlHeader can only be used on faces that are derived from
LocalFace.  UnixStreamFace is directly inherited from LocalFace,
TCP face has two specializations: generic TcpFace (strictly not local),
and LocalTcpFace.

refs #1213

Change-Id: I8a158c3bc4bb929eedd15757cfddecc0d1049f9f
diff --git a/daemon/mgmt/internal-face.cpp b/daemon/mgmt/internal-face.cpp
index 1f1a6cb..707ee30 100644
--- a/daemon/mgmt/internal-face.cpp
+++ b/daemon/mgmt/internal-face.cpp
@@ -12,7 +12,7 @@
 
 InternalFace::InternalFace()
 {
-
+  setLocal(true);
 }
 
 void
@@ -98,12 +98,6 @@
   throw Error("Internal face cannot be closed");
 }
 
-bool
-InternalFace::isLocal() const
-{
-  return true;
-}
-
 void
 InternalFace::setInterestFilter(const Name& filter,
                                 OnInterest onInterest)