We have a liquibase command that looks something like this:

```sh
/liquibase/liquibase \
       --driver=org.postgresql.Driver \
       --changeLogFile="db.changelog-master.xml" \
       --url=<redacted> \
       --username=<redacted> \
       --password=<redacted> \
       update \
       -Dcoreschema="${core_schema}"
```

After upgrading the CLI from 4.3.3 to 4.4.0, it fails with the following error:

```
Unexpected argument(s): -Dcoreschema=public

For detailed help, try 'liquibase --help' or 'liquibase <command-name> --help'
```

Since the release notes state "this release should be 100% backwards compatible", I expect this is an oversight? Or is there a replacement for the `-Dproperty=value` syntax? I haven't found one looking through `--help` and the [property substitution docs](https://docs.liquibase.com/concepts/basic/changelog-property-substitution.html) at least.

The syntax can also still be found on https://docs.liquibase.com/tools-integrations/cli/home.html:

![image](https://user-images.githubusercontent.com/2620907/122090597-36d63400-ce08-11eb-92e8-d320cd5c5baa.png)


subCommandSpec.usageMessage().hidden(true);
            } else {
                subCommandSpec.usageMessage().hidden(commandDefinition.getHidden());
            }
            showCommand = false;
            for (CommandArgumentDefinition<?> def : commandDefinition.getArguments().values()) {
                final String[] argNames = toArgNames(def);
                for (int i = 0; i < argNames.length; i++) {
                    final CommandLine.Model.OptionSpec.Builder builder = createArgBuilder(def, argNames[i]);
                    String argDisplaySuffix = "";
                    String argName = argNames[i];
                    String camelCaseArg = StringUtil.toCamelCase(argName.substring(2));
                    if (! argName.equals("--" + camelCaseArg)) {
                        argDisplaySuffix = "\n[deprecated: --" + camelCaseArg + "]";
                    }
                    String description =
                        "\n(liquibase.command." + def.getName() + " OR liquibase.command." +
                            StringUtil.join(commandDefinition.getName(), ".") + "." + def.getName() + ")\n" +
                        "(" + toEnvVariable("liquibase.command." + def.getName()) + " OR " +
                            toEnvVariable("liquibase.command." + StringUtil.join(commandDefinition.getName(), ".") +
                                "." + def.getName()) + ")" + argDisplaySuffix;
                    if (def.getDefaultValue() != null) {
                        if (def.getDefaultValueDescription() == null) {
                            description = "\nDEFAULT: " + def.getDefaultValue() + "\n" + description;
                        } else {
                            description = "\nDEFAULT: " + def.getDefaultValueDescription() + "\n" + description;
                        }
                    }
                    if (def.getDescription() != null) {
                        description = def.getDescription() + description;