Adding @Beta to Intent API classes and interfaces

Change-Id: I02a3c1a678cb4e75b5bba9a33117a9dccb6fc0f5
diff --git a/core/api/src/main/java/org/onosproject/net/intent/IntentExtensionService.java b/core/api/src/main/java/org/onosproject/net/intent/IntentExtensionService.java
index 786b60e..d7c7c64 100644
--- a/core/api/src/main/java/org/onosproject/net/intent/IntentExtensionService.java
+++ b/core/api/src/main/java/org/onosproject/net/intent/IntentExtensionService.java
@@ -15,12 +15,15 @@
  */
 package org.onosproject.net.intent;
 
+import com.google.common.annotations.Beta;
+
 import java.util.Map;
 
 /**
  * Service for extending the capability of intent framework by
  * adding additional compilers or/and installers.
  */
+@Beta
 public interface IntentExtensionService {
     /**
      * Registers the specified compiler for the given intent class.