Adding CLI command to list models and enhancing YANG smoke scenario
to validate that expected model is registered.

Change-Id: I4db10fcdb0fe5ad922b0312b10ba1e23387b7792
diff --git a/tools/test/scenarios/yang-smoke.xml b/tools/test/scenarios/yang-smoke.xml
index c55a0ba..b44646d 100644
--- a/tools/test/scenarios/yang-smoke.xml
+++ b/tools/test/scenarios/yang-smoke.xml
@@ -24,5 +24,7 @@
                       exec="onos-check-apps ${#} drivers,yang,yang-gui,models.openroadm includes"/>
             </parallel>
         </group>
+        <step name="Verify-Models" exec="onos ${OC1} models | grep org-openroadm-interfaces"
+              requires="Check-YANG-Apps-Activated"/>
     </group>
 </scenario>