Depend on released ONOS 2.2.1 artifacts

Change-Id: Ib921c6fc078cf0469e90d1dd6424cb8bf691d082
diff --git a/pom.xml b/pom.xml
index 3e69095..9e5d316 100644
--- a/pom.xml
+++ b/pom.xml
@@ -22,7 +22,7 @@
     <parent>
         <groupId>org.onosproject</groupId>
         <artifactId>onos-dependencies</artifactId>
-        <version>2.2.1-b4</version>
+        <version>2.2.1</version>
     </parent>
 
     <groupId>org.opencord</groupId>