[ONOS-4015] Implement Region administration CLI

- Implement region add/update/remove CLI
- Implement devices add/remove CLI

Change-Id: I38b40b24df7f864b0725104f63347081257743ac
diff --git a/cli/src/main/java/org/onosproject/cli/net/RegionRemoveCommand.java b/cli/src/main/java/org/onosproject/cli/net/RegionRemoveCommand.java
new file mode 100644
index 0000000..679404d
--- /dev/null
+++ b/cli/src/main/java/org/onosproject/cli/net/RegionRemoveCommand.java
@@ -0,0 +1,43 @@
+/*
+ * Copyright 2016 Open Networking Laboratory
+ *
+ * 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.cli.net;
+
+import org.apache.karaf.shell.commands.Argument;
+import org.apache.karaf.shell.commands.Command;
+import org.onosproject.cli.AbstractShellCommand;
+import org.onosproject.net.region.RegionAdminService;
+import org.onosproject.net.region.RegionId;
+
+/**
+ * Removes a region from the existing region list.
+ */
+@Command(scope = "onos", name = "region-remove",
+        description = "Removes an existing region.")
+public class RegionRemoveCommand extends AbstractShellCommand {
+
+    @Argument(index = 0, name = "id", description = "Region ID",
+            required = true, multiValued = false)
+    String id = null;
+
+    @Override
+    protected void execute() {
+        RegionAdminService service = get(RegionAdminService.class);
+        RegionId regionId = RegionId.regionId(id);
+
+        service.removeRegion(regionId);
+        print("Region with id %s is successfully removed.", regionId);
+    }
+}