Isolate IETF models in OpenConfig to own bundle

Change-Id: I15fff358582dd7b361d015c2d30c981a703fd1be
diff --git a/models/openconfig/pom.xml b/models/openconfig/pom.xml
index d81422b..cfa6354 100644
--- a/models/openconfig/pom.xml
+++ b/models/openconfig/pom.xml
@@ -47,6 +47,12 @@
             <version>${project.version}</version>
         </dependency>
 
+        <dependency>
+            <groupId>org.onosproject</groupId>
+            <artifactId>onos-models-ietf</artifactId>
+            <version>${project.version}</version>
+        </dependency>
+
     </dependencies>
 
     <build>