Upgrade ONOS to use 2.3.0-b2 version of the yang tools

Change-Id: I1111958d4d172320a00d595c20ff82a385a4be3e
diff --git a/lib/pom.xml b/lib/pom.xml
index bae6e67..5e5f11e 100644
--- a/lib/pom.xml
+++ b/lib/pom.xml
@@ -40,7 +40,7 @@
         <netty4.version>4.1.8.Final</netty4.version>
         <openflowj.version>3.2.0.onos</openflowj.version>
         <onos-maven-plugin.version>1.10</onos-maven-plugin.version>
-        <onos-yang-tools.version>2.2.0</onos-yang-tools.version>
+        <onos-yang-tools.version>2.3.0-b2</onos-yang-tools.version>
         <osgi.version>5.0.0</osgi.version>
         <karaf.version>3.0.8</karaf.version>
         <jersey.version>2.25.1</jersey.version>