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/pce/app/BUILD b/apps/pce/app/BUILD
index 027a2c1..9c2d107 100644
--- a/apps/pce/app/BUILD
+++ b/apps/pce/app/BUILD
@@ -1,12 +1,12 @@
 COMPILE_DEPS = CORE_DEPS + JACKSON + KRYO + CLI + REST + [
     "//core/store/serializers:onos-core-serializers",
-    "//incubator/api:onos-incubator-api",
+    "//apps/tunnel/api:onos-apps-tunnel-api",
     "//apps/pcep-api:onos-apps-pcep-api",
     "//apps/pce/bandwidthmgmt:onos-apps-pce-bandwidthmgmt",
 ]
 
 TEST_DEPS = TEST_REST + [
-    "//incubator/api:onos-incubator-api-tests",
+    "//apps/tunnel/api:onos-apps-tunnel-api-tests",
 ]
 
 osgi_jar_with_tests(