ONOS-3922: added missing expected() function to (synthesized) host links.

Change-Id: Id46e322cd7ffa293e9eef0c863263c763d1ab7bb
diff --git a/web/gui/src/main/webapp/app/view/topo/topoModel.js b/web/gui/src/main/webapp/app/view/topo/topoModel.js
index ed9eeb1..a21fc93 100644
--- a/web/gui/src/main/webapp/app/view/topo/topoModel.js
+++ b/web/gui/src/main/webapp/app/view/topo/topoModel.js
@@ -163,6 +163,7 @@
             tgtPort: host.cp.port,
 
             type: function () { return 'hostLink'; },
+            expected: function () { return true; },
             online: function () {
                 // hostlink target is edge switch
                 return lnk.target.online;