Added @Beta annotation to the flow objective API.

Change-Id: I4dd91921db1ff533b0ea1e3244dcdbf08b64a499
diff --git a/core/api/src/main/java/org/onosproject/net/flowobjective/FilteringObjective.java b/core/api/src/main/java/org/onosproject/net/flowobjective/FilteringObjective.java
index d037764..173ddfd 100644
--- a/core/api/src/main/java/org/onosproject/net/flowobjective/FilteringObjective.java
+++ b/core/api/src/main/java/org/onosproject/net/flowobjective/FilteringObjective.java
@@ -15,6 +15,7 @@
  */
 package org.onosproject.net.flowobjective;
 
+import com.google.common.annotations.Beta;
 import org.onosproject.core.ApplicationId;
 import org.onosproject.net.flow.criteria.Criterion;
 
@@ -26,6 +27,7 @@
  * be used by a device driver to construct the actual flow rules to
  * be installed on the device.
  */
+@Beta
 public interface FilteringObjective extends Objective {
 
     enum Type {