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/app/BUILD b/app/BUILD
index f5bb7ec..70c3589 100644
--- a/app/BUILD
+++ b/app/BUILD
@@ -1,7 +1,6 @@
 COMPILE_DEPS = CORE_DEPS + JACKSON + KRYO + CLI + [
     "//core/common:onos-core-common",
     "//core/store/serializers:onos-core-serializers",
-    "//incubator/api:onos-incubator-api",
     "//apps/route-service/api:onos-apps-route-service-api",
     "//apps/mcast/api:onos-apps-mcast-api",
     "//apps/mcast/cli:onos-apps-mcast-cli",
@@ -9,7 +8,6 @@
 
 TEST_DEPS = TEST_ADAPTERS + [
     "//core/net:onos-core-net",
-    "//incubator/api:onos-incubator-api-tests",
     "//apps/route-service/api:onos-apps-route-service-api-tests",
 ]