Update checkstyle to version 6.19

Change-Id: I32787f2a5f4f4b17fd4cdcf9bd2eb3903dcecfff
diff --git a/cli/src/main/java/org/onosproject/cli/net/vnet/VirtualPortBindCommand.java b/cli/src/main/java/org/onosproject/cli/net/vnet/VirtualPortBindCommand.java
index 2eb0a56..e0842e7 100644
--- a/cli/src/main/java/org/onosproject/cli/net/vnet/VirtualPortBindCommand.java
+++ b/cli/src/main/java/org/onosproject/cli/net/vnet/VirtualPortBindCommand.java
@@ -83,7 +83,7 @@
         VirtualNetworkService service = get(VirtualNetworkService.class);
         Set<VirtualPort> ports = service.getVirtualPorts(NetworkId.networkId(networkId),
                                                     DeviceId.deviceId(deviceId));
-        return ports.stream().filter(p->p.number().equals(aPortNumber))
+        return ports.stream().filter(p -> p.number().equals(aPortNumber))
                 .findFirst().get();
     }
 }