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/virtual/app/src/main/java/org/onosproject/incubator/net/virtual/cli/VirtualLinkListCommand.java b/apps/virtual/app/src/main/java/org/onosproject/incubator/net/virtual/cli/VirtualLinkListCommand.java
new file mode 100644
index 0000000..a69e0b7
--- /dev/null
+++ b/apps/virtual/app/src/main/java/org/onosproject/incubator/net/virtual/cli/VirtualLinkListCommand.java
@@ -0,0 +1,76 @@
+/*
+ * Copyright 2016-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.incubator.net.virtual.cli;
+
+import org.apache.karaf.shell.api.action.Argument;
+import org.apache.karaf.shell.api.action.Command;
+import org.apache.karaf.shell.api.action.Completion;
+import org.apache.karaf.shell.api.action.lifecycle.Service;
+import org.onosproject.cli.AbstractShellCommand;
+import org.onosproject.incubator.net.virtual.NetworkId;
+import org.onosproject.incubator.net.virtual.VirtualLink;
+import org.onosproject.incubator.net.virtual.VirtualNetworkService;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Lists all virtual links for the network ID.
+ */
+@Service
+@Command(scope = "onos", name = "vnet-links",
+        description = "Lists all virtual links in a virtual network.")
+public class VirtualLinkListCommand extends AbstractShellCommand {
+
+    private static final String FMT_VIRTUAL_LINK =
+            "src=%s, dst=%s, state=%s, tunnelId=%s";
+
+    @Argument(index = 0, name = "networkId", description = "Network ID",
+            required = true, multiValued = false)
+    @Completion(VirtualNetworkCompleter.class)
+    Long networkId = null;
+
+    @Override
+    protected void doExecute() {
+
+        getSortedVirtualLinks().forEach(this::printVirtualLink);
+    }
+
+    /**
+     * Returns the list of virtual links sorted using the device identifier.
+     *
+     * @return virtual link list
+     */
+    private List<VirtualLink> getSortedVirtualLinks() {
+        VirtualNetworkService service = get(VirtualNetworkService.class);
+
+        List<VirtualLink> virtualLinks = new ArrayList<>();
+        virtualLinks.addAll(service.getVirtualLinks(NetworkId.networkId(networkId)));
+        return virtualLinks;
+    }
+
+    /**
+     * Prints out each virtual link.
+     *
+     * @param virtualLink virtual link
+     */
+    private void printVirtualLink(VirtualLink virtualLink) {
+        print(FMT_VIRTUAL_LINK, virtualLink.src().toString(), virtualLink.dst().toString(),
+              virtualLink.state(),
+              virtualLink.tunnelId() == null ? null : virtualLink.tunnelId().toString());
+    }
+}