Detangling incubator: virtual nets, tunnels, resource labels, oh my

- virtual networking moved to /apps/virtual; with CLI & REST API
- tunnels and labels moved to /apps/tunnel; with CLI & REST API; UI disabled for now
- protobuf/models moved to /core/protobuf/models
- defunct grpc/rpc registry stuff left under /graveyard
- compile dependencies on /incubator moved to respective modules for compilation
- run-time dependencies will need to be re-tested for dependent apps

- /graveyard will be removed in not-too-distant future

Change-Id: I0a0b995c635487edcf95a352f50dd162186b0b39
diff --git a/apps/ofagent/src/main/java/org/onosproject/ofagent/api/OFAgent.java b/apps/ofagent/src/main/java/org/onosproject/ofagent/api/OFAgent.java
index 4602185..1257121 100644
--- a/apps/ofagent/src/main/java/org/onosproject/ofagent/api/OFAgent.java
+++ b/apps/ofagent/src/main/java/org/onosproject/ofagent/api/OFAgent.java
@@ -16,7 +16,7 @@
 package org.onosproject.ofagent.api;
 
 import org.onosproject.incubator.net.virtual.NetworkId;
-import org.onosproject.incubator.net.virtual.TenantId;
+import org.onosproject.net.TenantId;
 
 import java.util.Set;