Bump up ONOS to yang tools version 2.0

Change-Id: Ib22b256a15096c29eee83938866d06d283c37c4c
diff --git a/drivers/huawei/driver/pom.xml b/drivers/huawei/driver/pom.xml
index 373c23d..fc26a56 100644
--- a/drivers/huawei/driver/pom.xml
+++ b/drivers/huawei/driver/pom.xml
@@ -31,7 +31,7 @@
 
     <description>Huawei driver implementation</description>
     <properties>
-        <yang-tool-version>1.12.0-b7</yang-tool-version>
+        <yang-tool-version>2.0</yang-tool-version>
     </properties>
     <dependencies>
         <dependency>