Adding @Beta to Intent API classes and interfaces

Change-Id: I02a3c1a678cb4e75b5bba9a33117a9dccb6fc0f5
diff --git a/core/api/src/main/java/org/onosproject/net/intent/constraint/BandwidthConstraint.java b/core/api/src/main/java/org/onosproject/net/intent/constraint/BandwidthConstraint.java
index b4518d4..43b8e4b 100644
--- a/core/api/src/main/java/org/onosproject/net/intent/constraint/BandwidthConstraint.java
+++ b/core/api/src/main/java/org/onosproject/net/intent/constraint/BandwidthConstraint.java
@@ -15,6 +15,7 @@
  */
 package org.onosproject.net.intent.constraint;
 
+import com.google.common.annotations.Beta;
 import org.onosproject.net.Link;
 import org.onosproject.net.resource.link.BandwidthResource;
 import org.onosproject.net.resource.link.BandwidthResourceRequest;
@@ -30,6 +31,7 @@
 /**
  * Constraint that evaluates links based on available bandwidths.
  */
+@Beta
 public class BandwidthConstraint extends BooleanConstraint {
 
     private final BandwidthResource bandwidth;