[ONOS-5631] YANG tool independent of tool chain

Change-Id: I0858a55c3162a963eb3ba0e1611d0f8071985c25
diff --git a/plugin/pom.xml b/plugin/pom.xml
index fe8a014..d3526bd 100644
--- a/plugin/pom.xml
+++ b/plugin/pom.xml
@@ -33,6 +33,7 @@
     </properties>
 
     <modules>
+        <module>tool</module>
         <module>maven</module>
         <module>buck</module>
     </modules>