[VOL-3408] Retying deletion of default eapol flow if VOLTHA is taking too long to respond.
Creating a list of subscriber that failed programming

This way we can be sure that subscribers eventually get provisioned.

Change-Id: I3dd6707ea0809496c2eb748723d4f50e19770327
diff --git a/app/src/main/java/org/opencord/olt/cli/ShowFailedSubscribersCommand.java b/app/src/main/java/org/opencord/olt/cli/ShowFailedSubscribersCommand.java
new file mode 100644
index 0000000..5d6bf3d
--- /dev/null
+++ b/app/src/main/java/org/opencord/olt/cli/ShowFailedSubscribersCommand.java
@@ -0,0 +1,49 @@
+/*
+ * Copyright 2016-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.opencord.olt.cli;
+
+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.net.ConnectPoint;
+import org.opencord.olt.AccessDeviceService;
+import org.opencord.sadis.UniTagInformation;
+
+import java.util.Map;
+import java.util.Set;
+
+/**
+ * Shows subscriber information for those subscriber which have been programmed
+ * in the data-plane.
+ */
+@Service
+@Command(scope = "onos", name = "volt-failed-subscribers",
+        description = "Shows subscribers awaiting for programming in the dataplane")
+public class ShowFailedSubscribersCommand extends AbstractShellCommand {
+
+    @Override
+    protected void doExecute() {
+        AccessDeviceService service = AbstractShellCommand.get(AccessDeviceService.class);
+        Map<ConnectPoint, Set<UniTagInformation>> info = service.getFailedSubs();
+        info.forEach(this::display);
+    }
+
+    private void display(ConnectPoint cp, Set<UniTagInformation> uniTagInformation) {
+        uniTagInformation.forEach(uniTag ->
+                                          print("location=%s tagInformation=%s", cp, uniTag));
+    }
+}