ONOS-5503 Added CLIs for administering OFAgent

Change-Id: I58256316e2054952da9dce04bf927901761807e5
diff --git a/apps/ofagent/src/main/java/org/onosproject/ofagent/cli/OFAgentListCommand.java b/apps/ofagent/src/main/java/org/onosproject/ofagent/cli/OFAgentListCommand.java
new file mode 100644
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+++ b/apps/ofagent/src/main/java/org/onosproject/ofagent/cli/OFAgentListCommand.java
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+/*
+ * 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.ofagent.cli;
+
+import org.apache.karaf.shell.commands.Command;
+import org.onosproject.cli.AbstractShellCommand;
+import org.onosproject.ofagent.api.OFAgentService;
+
+import java.util.Set;
+import java.util.stream.Collectors;
+
+/**
+ * Lists the existing OFAgents.
+ */
+@Command(scope = "onos", name = "ofagents", description = "Lists all ofagents")
+public class OFAgentListCommand extends AbstractShellCommand {
+
+    private static final String FORMAT = "%-10s%-10s%-8s";
+    private static final String CTRL = "%s:%s";
+
+    @Override
+    protected void execute() {
+        OFAgentService service = get(OFAgentService.class);
+        print(FORMAT, "Network", "Status", "Controllers");
+
+        service.agents().forEach(agent -> {
+            Set<String> ctrls = agent.controllers().stream()
+                    .map(ctrl -> String.format(CTRL, ctrl.ip(), ctrl.port()))
+                    .collect(Collectors.toSet());
+            print(FORMAT, agent.networkId(), agent.state().name(), ctrls);
+        });
+    }
+}