ONOS-6034 Added purge and sync flow rules CLIs

Also removed unnecessary boxing from RoutingSnatHandler

Change-Id: Ibb0a1e5dc6465bbf378bf7d105e162f429f6c02a
diff --git a/apps/openstacknetworking/src/main/java/org/onosproject/openstacknetworking/cli/OpenstackPurgeRulesCommand.java b/apps/openstacknetworking/src/main/java/org/onosproject/openstacknetworking/cli/OpenstackPurgeRulesCommand.java
new file mode 100644
index 0000000..c6adee2
--- /dev/null
+++ b/apps/openstacknetworking/src/main/java/org/onosproject/openstacknetworking/cli/OpenstackPurgeRulesCommand.java
@@ -0,0 +1,44 @@
+/*
+ * 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.openstacknetworking.cli;
+
+import org.apache.karaf.shell.commands.Command;
+import org.onosproject.cli.AbstractShellCommand;
+import org.onosproject.core.ApplicationId;
+import org.onosproject.core.CoreService;
+import org.onosproject.net.flow.FlowRuleService;
+import org.onosproject.openstacknetworking.api.Constants;
+
+/**
+ * Purges all existing network states.
+ */
+@Command(scope = "onos", name = "openstack-purge-rules",
+        description = "Purges all flow rules installed by OpenStack networking app")
+public class OpenstackPurgeRulesCommand extends AbstractShellCommand {
+
+    @Override
+    protected void execute() {
+        FlowRuleService flowRuleService = AbstractShellCommand.get(FlowRuleService.class);
+        CoreService coreService = AbstractShellCommand.get(CoreService.class);
+        ApplicationId appId = coreService.getAppId(Constants.OPENSTACK_NETWORKING_APP_ID);
+        if (appId == null) {
+            error("Failed to purge OpenStack networking flow rules.");
+            return;
+        }
+        flowRuleService.removeFlowRulesById(appId);
+        print("Successfully purged flow rules installed by OpenStack networking application.");
+    }
+}