Add CLIs for k8s endpoins, pods and services, sync & purge states

Change-Id: I931ad76077639e80045f106c0014f113c76354d6
diff --git a/apps/k8s-networking/app/src/main/java/org/onosproject/k8snetworking/cli/K8sServiceListCommand.java b/apps/k8s-networking/app/src/main/java/org/onosproject/k8snetworking/cli/K8sServiceListCommand.java
new file mode 100644
index 0000000..800a1ab
--- /dev/null
+++ b/apps/k8s-networking/app/src/main/java/org/onosproject/k8snetworking/cli/K8sServiceListCommand.java
@@ -0,0 +1,58 @@
+/*
+ * Copyright 2019-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.k8snetworking.cli;
+
+import com.google.common.collect.Lists;
+import org.apache.karaf.shell.api.action.Command;
+import org.apache.karaf.shell.api.action.lifecycle.Service;
+import org.onosproject.cli.AbstractShellCommand;
+import org.onosproject.k8snetworking.api.K8sServiceService;
+
+import java.util.Comparator;
+import java.util.List;
+
+/**
+ * Lists kubernetes services.
+ */
+@Service
+@Command(scope = "onos", name = "k8s-services",
+        description = "Lists all kubernetes services")
+public class K8sServiceListCommand extends AbstractShellCommand {
+
+    private static final String FORMAT = "%-50s%-30s%-30s";
+
+    @Override
+    protected void doExecute() {
+        K8sServiceService service = get(K8sServiceService.class);
+        List<io.fabric8.kubernetes.api.model.Service> services =
+                Lists.newArrayList(service.services());
+        services.sort(Comparator.comparing(s -> s.getMetadata().getName()));
+
+        print(FORMAT, "Name", "Cluster IP", "Ports");
+
+        for (io.fabric8.kubernetes.api.model.Service svc : services) {
+
+            List<Integer> ports = Lists.newArrayList();
+
+            svc.getSpec().getPorts().forEach(p -> ports.add(p.getPort()));
+
+            print(FORMAT,
+                    svc.getMetadata().getName(),
+                    svc.getSpec().getClusterIP(),
+                    ports.isEmpty() ? "" : ports);
+        }
+    }
+}