face: Fixing bug with InternalFace considered not local and changing "isLocal" method to be pure virtual

This way the decision about the face locality has to be done explicitly
inside specific face implementation and potentially avoids problems.

Change-Id: I5219cce87385313546453d14a5a7ca4542893911
diff --git a/daemon/face/stream-face.hpp b/daemon/face/stream-face.hpp
index 9573813..ac08421 100644
--- a/daemon/face/stream-face.hpp
+++ b/daemon/face/stream-face.hpp
@@ -34,7 +34,7 @@
 
   virtual void
   close();
-  
+
 protected:
   void
   handleSend(const boost::system::error_code& error,