Adding a comand to clear allocations, useful when running tests

Change-Id: I2a9f45c971babf1d3746745815de35bbd1f840a2
diff --git a/app/src/main/java/org/opencord/dhcpl2relay/cli/DhcpL2RelayRemoveAllocationsCommand.java b/app/src/main/java/org/opencord/dhcpl2relay/cli/DhcpL2RelayRemoveAllocationsCommand.java
new file mode 100644
index 0000000..7120923
--- /dev/null
+++ b/app/src/main/java/org/opencord/dhcpl2relay/cli/DhcpL2RelayRemoveAllocationsCommand.java
@@ -0,0 +1,65 @@
+/*
+ * 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.dhcpl2relay.cli;
+
+import org.apache.karaf.shell.api.action.Argument;
+import org.apache.karaf.shell.api.action.Command;
+import org.apache.karaf.shell.api.action.Completion;
+import org.apache.karaf.shell.api.action.lifecycle.Service;
+import org.onosproject.cli.AbstractShellCommand;
+import org.onosproject.cli.net.DeviceIdCompleter;
+import org.onosproject.cli.net.PortNumberCompleter;
+import org.onosproject.net.ConnectPoint;
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.PortNumber;
+import org.opencord.dhcpl2relay.DhcpL2RelayService;
+
+/**
+ * Remove all the DHCP allocations relayed by the dhcpl2relay.
+ */
+@Service
+@Command(scope = "onos", name = "dhcpl2relay-remove-allocation",
+        description = "Remove the DHCP allocation relayed by the dhcpl2relay")
+public class DhcpL2RelayRemoveAllocationsCommand extends AbstractShellCommand {
+
+    @Argument(index = 0, name = "deviceId", description = "Device ID",
+            required = true, multiValued = false)
+    @Completion(DeviceIdCompleter.class)
+    private String strDeviceId = null;
+
+    @Argument(index = 1, name = "port", description = "Port number",
+            required = true, multiValued = false)
+    @Completion(PortNumberCompleter.class)
+    private String strPort = null;
+
+    @Override
+    protected void doExecute() {
+        DhcpL2RelayService service = get(DhcpL2RelayService.class);
+
+        DeviceId deviceId = DeviceId.deviceId(strDeviceId);
+        PortNumber port = PortNumber.portNumber(strPort);
+        ConnectPoint cp = new ConnectPoint(deviceId, port);
+
+        Boolean success = service.removeAllocationByConnectPoint(cp);
+
+        if (success) {
+            print("DHCP Allocation removed for port %s on device %s", strPort, strDeviceId);
+        } else {
+            print("DHCP Allocation not found for port %s on device %s", strPort, strDeviceId);
+        }
+
+    }
+}