Bump onos-yang-utils to version 2.2.0

Change-Id: I53fae36d21278ba67224a9044e83063f2b6e1f82
(cherry picked from commit e9019321ac484f6ab65aaaaf72788da33663067d)
diff --git a/lib/pom.xml b/lib/pom.xml
index 55eea9a..07ef09b 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-b6</onos-yang-tools.version>
+        <onos-yang-tools.version>2.2.0</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>