Adding @Beta to Intent API classes and interfaces

Change-Id: I02a3c1a678cb4e75b5bba9a33117a9dccb6fc0f5
diff --git a/core/api/src/main/java/org/onosproject/net/intent/OpticalPathIntent.java b/core/api/src/main/java/org/onosproject/net/intent/OpticalPathIntent.java
index 1fee24e..5a5461c 100644
--- a/core/api/src/main/java/org/onosproject/net/intent/OpticalPathIntent.java
+++ b/core/api/src/main/java/org/onosproject/net/intent/OpticalPathIntent.java
@@ -15,6 +15,7 @@
  */
 package org.onosproject.net.intent;
 
+import com.google.common.annotations.Beta;
 import org.onosproject.core.ApplicationId;
 import org.onosproject.net.ConnectPoint;
 import org.onosproject.net.OchSignal;
@@ -26,6 +27,10 @@
 
 import static com.google.common.base.Preconditions.checkNotNull;
 
+/**
+ * An optical layer intent with explicitly selected path.
+ */
+@Beta
 public final class OpticalPathIntent extends Intent {
 
     private final ConnectPoint src;