[ONOS-6467] (vNet) Deprecate tunnel operations

We plan to remove tunnel operations which augmented through
virtual intent.
As one of efforts to redesign vNet Intent Service, we'll deprecate
those tunnel operations.

Change-Id: I029ceda320b7c02068ab2ebbfe43b26dd2efa66e
diff --git a/incubator/api/src/main/java/org/onosproject/incubator/net/virtual/VirtualNetworkStore.java b/incubator/api/src/main/java/org/onosproject/incubator/net/virtual/VirtualNetworkStore.java
index 0e6b2a9..0f1936e 100644
--- a/incubator/api/src/main/java/org/onosproject/incubator/net/virtual/VirtualNetworkStore.java
+++ b/incubator/api/src/main/java/org/onosproject/incubator/net/virtual/VirtualNetworkStore.java
@@ -240,6 +240,7 @@
      * @param intent   intent
      * @param tunnelId tunnel identifier
      */
+    @Deprecated
     void addTunnelId(Intent intent, TunnelId tunnelId);
 
     /**
@@ -248,6 +249,7 @@
      * @param intent intent
      * @return set of tunnel identifiers
      */
+    @Deprecated
     Set<TunnelId> getTunnelIds(Intent intent);
 
     /**
@@ -256,5 +258,6 @@
      * @param intent   intent
      * @param tunnelId tunnel identifier
      */
+    @Deprecated
     void removeTunnelId(Intent intent, TunnelId tunnelId);
 }