Bumping version of YANG Tools to 2.1; adding YANG smoke STC test.

Change-Id: I8bd719351a5dbe6af286779fdc3ac3105c2bbc62
diff --git a/tools/test/scenarios/smoke.xml b/tools/test/scenarios/smoke.xml
index 5cb9e62..5b95e70 100644
--- a/tools/test/scenarios/smoke.xml
+++ b/tools/test/scenarios/smoke.xml
@@ -20,6 +20,7 @@
     <import file="${ONOS_SCENARIOS}/maps-cli.xml"/>
     <import file="${ONOS_SCENARIOS}/dist-test.xml"/>
     <import file="${ONOS_SCENARIOS}/smoke-internal.xml"/>
+    <import file="${ONOS_SCENARIOS}/yang-smoke.xml"/>
 
     <dependency name="Setup" requires="Prerequisites,Net-Prerequisites"/>
     <dependency name="Net-Smoke" requires="Setup"/>
@@ -28,7 +29,8 @@
     <dependency name="Meta-App" requires="Setup"/>
     <dependency name="Netcfg" requires="Setup"/>
     <dependency name="Distributed-Primitives" requires="Setup"/>
+    <dependency name="YANG-Smoke" requires="Setup,~Distributed-Primitives"/>
 
     <import file="${ONOS_SCENARIOS}/wrapup.xml"/>
-    <dependency name="Wrapup" requires="~Setup,~Net-Smoke,~Drivers-Test,~Meta-App,~Netcfg"/>
+    <dependency name="Wrapup" requires="~Setup,~Net-Smoke,~Drivers-Test,~Meta-App,~Netcfg,~YANG-Smoke"/>
 </scenario>