Add builder function to IntObjective

Change-Id: Ief782b264b618d18174a476febe5960cfb28583f
(cherry picked from commit b7b79af9702f03c1286b8f2f9d98e6b87b29c467)
diff --git a/core/api/src/main/java/org/onosproject/net/behaviour/inbandtelemetry/IntObjective.java b/core/api/src/main/java/org/onosproject/net/behaviour/inbandtelemetry/IntObjective.java
index b73e9c2..b1d842e 100644
--- a/core/api/src/main/java/org/onosproject/net/behaviour/inbandtelemetry/IntObjective.java
+++ b/core/api/src/main/java/org/onosproject/net/behaviour/inbandtelemetry/IntObjective.java
@@ -67,6 +67,15 @@
     }
 
     /**
+     * Returns a new INT objective builder.
+     *
+     * @return INT objective builder
+     */
+    public static IntObjective.Builder builder() {
+        return new Builder();
+    }
+
+    /**
      * An IntObjective builder.
      */
     public static final class Builder {