face: give ProtocolFactory access to NetworkMonitor

Subclasses of ProtocolFactory can access NetworkMonitor and
addFace callback anytime via member fields. They are supplied
to ProtocolFactory::create from FaceSystem.

This is in preparation for letting ProtocolFactory subclasses
react to fine-grained signals from NetworkMonitor.

refs #4021

Change-Id: I8da116bffc83d1bdeed7fd3b2e12c8872f19177b
diff --git a/daemon/face/unix-stream-factory.cpp b/daemon/face/unix-stream-factory.cpp
index a7aeadb..2d5fe94 100644
--- a/daemon/face/unix-stream-factory.cpp
+++ b/daemon/face/unix-stream-factory.cpp
@@ -1,5 +1,5 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
-/**
+/*
  * Copyright (c) 2014-2017,  Regents of the University of California,
  *                           Arizona Board of Regents,
  *                           Colorado State University,
@@ -74,7 +74,7 @@
   if (!context.isDryRun) {
     auto channel = this->createChannel(path);
     if (!channel->isListening()) {
-      channel->listen(context.addFace, nullptr);
+      channel->listen(this->addFace, nullptr);
     }
   }
 }