Adding @Beta to Intent API classes and interfaces

Change-Id: I02a3c1a678cb4e75b5bba9a33117a9dccb6fc0f5
diff --git a/core/api/src/main/java/org/onosproject/net/intent/IntentId.java b/core/api/src/main/java/org/onosproject/net/intent/IntentId.java
index b3077c5..a88fa2f 100644
--- a/core/api/src/main/java/org/onosproject/net/intent/IntentId.java
+++ b/core/api/src/main/java/org/onosproject/net/intent/IntentId.java
@@ -15,10 +15,13 @@
  */
 package org.onosproject.net.intent;
 
+import com.google.common.annotations.Beta;
+
 /**
  * Intent identifier suitable as an external key.
  * <p>This class is immutable.</p>
  */
+@Beta
 public final class IntentId {
 
     private final long value;