Adding @Beta to TunnelService and associated API classes

Change-Id: I58ea6b5ef63ed9a6f7c45a3f27ed08fc70683acd
diff --git a/incubator/api/src/main/java/org/onosproject/incubator/net/tunnel/TunnelProvider.java b/incubator/api/src/main/java/org/onosproject/incubator/net/tunnel/TunnelProvider.java
index 1107fc1..5677901 100644
--- a/incubator/api/src/main/java/org/onosproject/incubator/net/tunnel/TunnelProvider.java
+++ b/incubator/api/src/main/java/org/onosproject/incubator/net/tunnel/TunnelProvider.java
@@ -16,6 +16,7 @@
 
 package org.onosproject.incubator.net.tunnel;
 
+import com.google.common.annotations.Beta;
 import org.onosproject.net.ElementId;
 import org.onosproject.net.Path;
 import org.onosproject.net.provider.Provider;
@@ -23,6 +24,7 @@
 /**
  * Abstraction of an entity providing tunnel setup/release services to the core.
  */
+@Beta
 public interface TunnelProvider extends Provider {
 
     /**