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/l3vpn/BUILD b/apps/l3vpn/BUILD
index 8064faa..1c4b585 100644
--- a/apps/l3vpn/BUILD
+++ b/apps/l3vpn/BUILD
@@ -4,7 +4,7 @@
     "//core/store/serializers:onos-core-serializers",
     "//apps/yang:onos-apps-yang",
     "//apps/pce/app:onos-apps-pce-app",
-    "//incubator/api:onos-incubator-api",
+    "//apps/tunnel/api:onos-apps-tunnel-api",
     "//models/common:onos-models-common",
 ]
 
@@ -18,6 +18,7 @@
     "org.onosproject.config",
     "org.onosproject.restconf",
     "org.onosproject.protocols.restconfserver",
+    "org.onosproject.tunnel",
     "org.onosproject.netconf",
     "org.onosproject.netconfsb",
     "org.onosproject.models.common",