Adding EVPN App code

Change-Id: Id3b2192f56f054cadcd8384092245b8757a781a9
diff --git a/apps/evpnopenflow/src/main/java/org/onosproject/evpnopenflow/rsc/cli/VpnInstListCommand.java b/apps/evpnopenflow/src/main/java/org/onosproject/evpnopenflow/rsc/cli/VpnInstListCommand.java
new file mode 100755
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--- /dev/null
+++ b/apps/evpnopenflow/src/main/java/org/onosproject/evpnopenflow/rsc/cli/VpnInstListCommand.java
@@ -0,0 +1,49 @@
+/*
+ * Copyright 2017-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.evpnopenflow.rsc.cli;
+
+import org.apache.karaf.shell.commands.Command;
+import org.onosproject.cli.AbstractShellCommand;
+import org.onosproject.evpnopenflow.rsc.EvpnConstants;
+import org.onosproject.evpnopenflow.rsc.VpnInstance;
+import org.onosproject.evpnopenflow.rsc.vpninstance.VpnInstanceService;
+
+import java.util.Collection;
+
+/**
+ * Support for displaying EVPN VPN instances.
+ */
+@Command(scope = "onos", name = "evpn-instance-list", description = "Lists " +
+        "all EVPN instances")
+public class VpnInstListCommand extends AbstractShellCommand {
+
+    @Override
+    protected void execute() {
+        VpnInstanceService service = get(VpnInstanceService.class);
+        Collection<VpnInstance> vpnInstances = service
+                .getInstances();
+        vpnInstances.forEach(vpnInstance -> {
+            print(EvpnConstants.FORMAT_VPN_INSTANCE, vpnInstance.id(),
+                  vpnInstance.description(),
+                  vpnInstance.vpnInstanceName(),
+                  vpnInstance.routeDistinguisher(),
+                  vpnInstance.getExportRouteTargets(),
+                  vpnInstance.getImportRouteTargets());
+        });
+    }
+
+}