ONOS-6825: added OFAgent tracer

Change-Id: Ib04184b5fe108c636f8fb9c4b721a1004b72c0a7
diff --git a/incubator/api/src/main/java/org/onosproject/incubator/net/virtual/VirtualNetworkService.java b/incubator/api/src/main/java/org/onosproject/incubator/net/virtual/VirtualNetworkService.java
index 2e208e8..aa513ec 100644
--- a/incubator/api/src/main/java/org/onosproject/incubator/net/virtual/VirtualNetworkService.java
+++ b/incubator/api/src/main/java/org/onosproject/incubator/net/virtual/VirtualNetworkService.java
@@ -46,6 +46,24 @@
     Set<VirtualNetwork> getVirtualNetworks(TenantId tenantId);
 
     /**
+     * Returns the virtual network matching the network identifier.
+     *
+     * @param networkId virtual network identifier
+     * @return virtual network instance
+     * @throws org.onlab.util.ItemNotFoundException if no such network found
+     */
+    VirtualNetwork getVirtualNetwork(NetworkId networkId);
+
+    /**
+     * Returns {@code tenantId} for specified virtual network id.
+     *
+     * @param networkId virtual network identifier
+     * @return tenantId tenant identifier
+     * @throws org.onlab.util.ItemNotFoundException if no such network found
+     */
+    TenantId getTenantId(NetworkId networkId);
+
+    /**
      * Returns a collection of all virtual devices in the specified network.
      *
      * @param networkId network identifier