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
new file mode 100644
index 0000000..b44646d
--- /dev/null
+++ b/tools/test/scenarios/yang-smoke.xml
@@ -0,0 +1,30 @@
+<!--
+  ~ Copyright 2017-present Open Networking Laboratory
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~     http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+<scenario name="yang-smoke" description="Basic smoke test for YANG subsystem">
+    <group name="YANG-Smoke">
+        <step name="Activate-YANG-Apps"
+              exec="onos ${OC1} app activate org.onosproject.yang-gui org.onosproject.models.openroadm"/>
+        <group name="Check-YANG-Apps-Activated"
+               requires="Activate-YANG-Apps">
+            <parallel var="${OC#}">
+                <step name="Check-YANG-Apps-Activated-${#}"
+                      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>