Bump up ONOS to yang tools version 2.0

Change-Id: Ib22b256a15096c29eee83938866d06d283c37c4c
diff --git a/apps/restconf/restconfmgr/pom.xml b/apps/restconf/restconfmgr/pom.xml
index 68f4efe..4f014de 100644
--- a/apps/restconf/restconfmgr/pom.xml
+++ b/apps/restconf/restconfmgr/pom.xml
@@ -32,7 +32,7 @@
         <dependency>
             <groupId>org.onosproject</groupId>
             <artifactId>onos-yang-model</artifactId>
-            <version>1.12.0-b8</version>
+            <version>2.0</version>
         </dependency>
         <dependency>
             <groupId>org.onosproject</groupId>