[ONOS-6549] (vNet) Balance role commands for virtual netwrok

Change-Id: Iadf22cd735bed0b055ada5542be8b1d2edb8188e
diff --git a/cli/src/main/java/org/onosproject/cli/net/vnet/VirtualNetworkBalanceMastersCommand.java b/cli/src/main/java/org/onosproject/cli/net/vnet/VirtualNetworkBalanceMastersCommand.java
new file mode 100644
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+/*
+ * Copyright 2014-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.cli.net.vnet;
+
+import org.apache.karaf.shell.commands.Argument;
+import org.apache.karaf.shell.commands.Command;
+import org.onosproject.cli.AbstractShellCommand;
+import org.onosproject.incubator.net.virtual.NetworkId;
+import org.onosproject.incubator.net.virtual.VirtualNetworkService;
+import org.onosproject.mastership.MastershipAdminService;
+
+/**
+ * Forces virtual network device mastership rebalancing.
+ */
+@Command(scope = "onos", name = "vnet-balance-masters",
+        description = "Forces virtual network device mastership rebalancing")
+public class VirtualNetworkBalanceMastersCommand extends AbstractShellCommand {
+    @Argument(index = 0, name = "networkId", description = "Network ID",
+            required = true, multiValued = false)
+    Long networkId = null;
+    @Override
+    protected void execute() {
+        VirtualNetworkService vnetService = get(VirtualNetworkService.class);
+        MastershipAdminService mastershipAdminService = vnetService
+                .get(NetworkId.networkId(networkId), MastershipAdminService.class);
+        mastershipAdminService.balanceRoles();
+    }
+}