face: Connect faces to the parent (unicast) or associated (multicast) channels

Change-Id: Ie7b2e8fb60050a2bc6e4f5ad053c26e121f3c3d5
Refs: #4973
diff --git a/daemon/face/unix-stream-channel.cpp b/daemon/face/unix-stream-channel.cpp
index b60ba78..760a264 100644
--- a/daemon/face/unix-stream-channel.cpp
+++ b/daemon/face/unix-stream-channel.cpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2014-2019,  Regents of the University of California,
+ * Copyright (c) 2014-2020,  Regents of the University of California,
  *                           Arizona Board of Regents,
  *                           Colorado State University,
  *                           University Pierre & Marie Curie, Sorbonne University,
@@ -137,6 +137,7 @@
   auto linkService = make_unique<GenericLinkService>(options);
   auto transport = make_unique<UnixStreamTransport>(std::move(m_socket));
   auto face = make_shared<Face>(std::move(linkService), std::move(transport));
+  face->setChannel(shared_from_this()); // use weak_from_this() in C++17
 
   ++m_size;
   connectFaceClosedSignal(*face, [this] { --m_size; });