CLI to configure extra link attributes

Change-Id: I841857dc1f281a69565a68d38e99621ed15b62c9
diff --git a/cli/src/main/java/org/onosproject/cli/net/completer/LinkTypeCompleter.java b/cli/src/main/java/org/onosproject/cli/net/completer/LinkTypeCompleter.java
new file mode 100644
index 0000000..1c41bb6
--- /dev/null
+++ b/cli/src/main/java/org/onosproject/cli/net/completer/LinkTypeCompleter.java
@@ -0,0 +1,39 @@
+/*
+ * Copyright 2017-present 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.completer;
+
+import java.util.Comparator;
+import java.util.EnumSet;
+import java.util.List;
+import java.util.stream.Collectors;
+
+import org.onosproject.cli.AbstractChoicesCompleter;
+import org.onosproject.net.Link;
+
+/**
+ * Completer for {@link Link.Type}.
+ */
+public class LinkTypeCompleter extends AbstractChoicesCompleter {
+
+    @Override
+    protected List<String> choices() {
+        return EnumSet.allOf(Link.Type.class).stream()
+                .sorted(Comparator.comparingInt(Enum::ordinal))
+                .map(Enum::name)
+                .collect(Collectors.toList());
+    }
+
+}