Upgrade buck and yangtools version

Change-Id: Ia79fb009371661417eddbc7740195c72d8488e18
diff --git a/lib/deps.json b/lib/deps.json
index b5675dd..edc64d3 100644
--- a/lib/deps.json
+++ b/lib/deps.json
@@ -234,12 +234,12 @@
     "onos-yang-datamodel": "mvn:org.onosproject:onos-yang-datamodel:1.11",
     "onos-yang-maven-plugin": "mvn:org.onosproject:onos-yang-maven-plugin:1.11",
     "onos-yang-utils-generator": "mvn:org.onosproject:onos-yang-utils-generator:1.11",
-    "onos-yang-model":"mvn:org.onosproject:onos-yang-model:2.2.0-b4",
-    "onos-yang-compiler-api":"mvn:org.onosproject:onos-yang-compiler-api:2.2.0-b4",
-    "onos-yang-runtime":"mvn:org.onosproject:onos-yang-runtime:2.2.0-b4",
-    "onos-yang-serializers-json":"mvn:org.onosproject:onos-yang-serializers-json:2.2.0-b4",
-    "onos-yang-serializers-xml":"mvn:org.onosproject:onos-yang-serializers-xml:2.2.0-b4",
-    "onos-yang-serializers-utils":"mvn:org.onosproject:onos-yang-serializers-utils:2.2.0-b4",
+    "onos-yang-model":"mvn:org.onosproject:onos-yang-model:2.2.0-b6",
+    "onos-yang-compiler-api":"mvn:org.onosproject:onos-yang-compiler-api:2.2.0-b6",
+    "onos-yang-runtime":"mvn:org.onosproject:onos-yang-runtime:2.2.0-b6",
+    "onos-yang-serializers-json":"mvn:org.onosproject:onos-yang-serializers-json:2.2.0-b6",
+    "onos-yang-serializers-xml":"mvn:org.onosproject:onos-yang-serializers-xml:2.2.0-b6",
+    "onos-yang-serializers-utils":"mvn:org.onosproject:onos-yang-serializers-utils:2.2.0-b6",
     "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",