Bump up ONOS to version 2.3.1 of yangtools

Change-Id: I96c3ce7672df6c11f9049eb8462b395b75087da2
diff --git a/lib/deps.json b/lib/deps.json
index 01541d6..59fdddf 100644
--- a/lib/deps.json
+++ b/lib/deps.json
@@ -238,12 +238,12 @@
     "openstack4j-http-connector": "mvn:org.pacesys.openstack4j.connectors:openstack4j-http-connector:2.11",
     "openstack4j-httpclient": "mvn:org.pacesys.openstack4j.connectors:openstack4j-httpclient:2.11",
     // Note: update BVER in tools/dev/bin/patch-yang-libs
-    "onos-yang-model":"mvn:org.onosproject:onos-yang-model:2.3",
-    "onos-yang-compiler-api":"mvn:org.onosproject:onos-yang-compiler-api:2.3",
-    "onos-yang-runtime":"mvn:org.onosproject:onos-yang-runtime:2.3",
-    "onos-yang-serializers-json":"mvn:org.onosproject:onos-yang-serializers-json:2.3",
-    "onos-yang-serializers-xml":"mvn:org.onosproject:onos-yang-serializers-xml:2.3",
-    "onos-yang-serializers-utils":"mvn:org.onosproject:onos-yang-serializers-utils:2.3",
+    "onos-yang-model":"mvn:org.onosproject:onos-yang-model:2.3.1",
+    "onos-yang-compiler-api":"mvn:org.onosproject:onos-yang-compiler-api:2.3.1",
+    "onos-yang-runtime":"mvn:org.onosproject:onos-yang-runtime:2.3.1",
+    "onos-yang-serializers-json":"mvn:org.onosproject:onos-yang-serializers-json:2.3.1",
+    "onos-yang-serializers-xml":"mvn:org.onosproject:onos-yang-serializers-xml:2.3.1",
+    "onos-yang-serializers-utils":"mvn:org.onosproject:onos-yang-serializers-utils:2.3.1",
     "org.apache.servicemix.bundles.dom4j":"mvn:org.apache.servicemix.bundles:org.apache.servicemix.bundles.dom4j:1.6.1_5",
     "plexus-utils": "mvn:org.codehaus.plexus:plexus-utils:3.0.24",
     "sshd-core": "mvn:org.apache.sshd:sshd-core:1.4.0",