ODTN manual testing tool for OpenConfig configuration

- ONOS-7567

Example:
onos> odtn-manual-test ENABLE_TRANSCEIVER
JSON:
{
  "openconfig-platform:component" : [ {
    "name" : "TRANSCEIVER_1_1_4_1",
    "openconfig-platform-transceiver:transceiver" : {
      "config" : {
        "enabled" : "true"
      }
    },
    "config" : {
      "name" : "TRANSCEIVER_1_1_4_1"
    }
  } ]
}
XML:
<rpc xmlns="urn:ietf:params:xml:ns:netconf:base:1.0">
  <edit-config>
    <target>
      <running/>
    </target>
    <config xmlns:xc="urn:ietf:params:xml:ns:netconf:base:1.0">
      <component xmlns="http://openconfig.net/yang/platform" xc:operation="merge">
        <name>TRANSCEIVER_1_1_4_1</name>
        <transceiver xmlns="http://openconfig.net/yang/platform/transceiver">
          <config>
            <enabled>true</enabled>
          </config>
        </transceiver>
        <config>
          <name>TRANSCEIVER_1_1_4_1</name>
        </config>
      </component>
    </config>
  </edit-config>
</rpc>

Change-Id: Ief5f1a1933fb00a2118bd941d8c5f0310ed9c815
diff --git a/apps/odtn/src/main/java/org/onosproject/odtn/cli/impl/ModeCompleter.java b/apps/odtn/src/main/java/org/onosproject/odtn/cli/impl/ModeCompleter.java
new file mode 100644
index 0000000..f00a3f8
--- /dev/null
+++ b/apps/odtn/src/main/java/org/onosproject/odtn/cli/impl/ModeCompleter.java
@@ -0,0 +1,35 @@
+/*
+ * 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.odtn.cli.impl;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.stream.Collectors;
+
+
+import org.onosproject.cli.AbstractChoicesCompleter;
+import org.onosproject.odtn.cli.impl.OdtnManualTestCommand.Mode;
+
+public class ModeCompleter extends AbstractChoicesCompleter {
+
+    @Override
+    protected List<String> choices() {
+        return Arrays.asList(Mode.values())
+                .stream()
+                .map(Enum::name)
+                .collect(Collectors.toList());
+    }
+}