Adding @Beta to Intent API classes and interfaces

Change-Id: I02a3c1a678cb4e75b5bba9a33117a9dccb6fc0f5
diff --git a/core/api/src/main/java/org/onosproject/net/intent/IntentState.java b/core/api/src/main/java/org/onosproject/net/intent/IntentState.java
index e36bf4c..1e5fd05 100644
--- a/core/api/src/main/java/org/onosproject/net/intent/IntentState.java
+++ b/core/api/src/main/java/org/onosproject/net/intent/IntentState.java
@@ -15,9 +15,12 @@
  */
 package org.onosproject.net.intent;
 
+import com.google.common.annotations.Beta;
+
 /**
  * Representation of the phases an intent may attain during its lifecycle.
  */
+@Beta
 public enum IntentState {
 
     /**