face: configuration option to make Ethernet face "ad hoc"

Change-Id: I55aeb2ca38ec34365b2d5d951b9ca2d7b05f46b2
Refs: #4018, #3967
diff --git a/daemon/face/ethernet-factory.hpp b/daemon/face/ethernet-factory.hpp
index d1b9ee2..9facd71 100644
--- a/daemon/face/ethernet-factory.hpp
+++ b/daemon/face/ethernet-factory.hpp
@@ -80,6 +80,7 @@
   {
     bool isEnabled = false;
     ethernet::Address group = ethernet::getDefaultMulticastAddress();
+    ndn::nfd::LinkType linkType = ndn::nfd::LINK_TYPE_MULTI_ACCESS;
     NetworkInterfacePredicate netifPredicate;
   };