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)


CommandLine.Model.OptionSpec.builder("--" + arg)
                    .required(false)
                    .type(String.class)
                    .hidden(true)
                    .description("Legacy global argument");
            rootCommandSpec.addOption(optionBuilder.build());
            String kabobArg = StringUtil.toKabobCase(arg);
            if (! kabobArg.equals(arg)) {
                final CommandLine.Model.OptionSpec.Builder kabobOptionBuilder =
                    CommandLine.Model.OptionSpec.builder("--" + kabobArg)
                        .required(false)
                        .type(String.class)
                        .hidden(true)
                        .description("Legacy global argument");
                rootCommandSpec.addOption(kabobOptionBuilder.build());
            }
        }
    }
    private void configureHelp(CommandLine.Model.CommandSpec commandSpec, boolean includeVersion) {
        String footer = "Each argument contains the corresponding 'configuration key' in parentheses. " +
                "As an alternative to passing values on the command line, these keys can be used as a basis for configuration settings in other locations.\n\n" +
                "Available configuration locations, in order of priority:\n" +
                "- Command line arguments (argument name in --help)\n" +
                "- Java system properties (configuration key listed above)\n" +
                "- Environment values (env variable listed above)\n" +
                "- Defaults file (configuration key OR argument name)\n\n" +
                "Full documentation is available at\n" +
                "http:www.liquibase.org";
        commandSpec.addOption(CommandLine.Model.OptionSpec.builder("--help", "-h")
                .description("Show this help message and exit")