Add group table, flow rules by listening to openstack node events

Change-Id: Ifbb1ae9c812e9bc24260e960c17b5430dcf59a11
diff --git a/apps/openstackvtap/app/src/main/java/org/onosproject/openstackvtap/cli/VtapTypeCompleter.java b/apps/openstackvtap/app/src/main/java/org/onosproject/openstackvtap/cli/VtapTypeCompleter.java
new file mode 100644
index 0000000..2784833
--- /dev/null
+++ b/apps/openstackvtap/app/src/main/java/org/onosproject/openstackvtap/cli/VtapTypeCompleter.java
@@ -0,0 +1,36 @@
+/*
+ * Copyright 2018-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.openstackvtap.cli;
+
+import com.google.common.collect.Lists;
+import org.onosproject.cli.AbstractChoicesCompleter;
+
+import java.util.List;
+
+/**
+ * vTap type completer.
+ */
+public class VtapTypeCompleter extends AbstractChoicesCompleter {
+
+    @Override
+    protected List<String> choices() {
+        List<String> strings = Lists.newArrayList();
+        strings.add("tx");
+        strings.add("rx");
+        strings.add("all");
+        return strings;
+    }
+}