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)


} else {
                final String legacyTag = this.legacyPositionalArguments.get(argAsKey);
                if (legacyTag == null) {
                    returnArgs.add(arg);
                } else {
                    returnArgs.add(arg);
                    String value = " ";
                    while (iterator.hasNext()) {
                        arg = iterator.next();
                        if (arg.startsWith("-")) {
                            iterator.previous();
                            break;
                        } else {
                            value += arg + " ";
                        }
                    }
                    value = StringUtil.trimToNull(value);
                    if (value != null) {
                        returnArgs.add("--" + legacyTag);
                        returnArgs.add(value);
                    }
                }
            }
        }
        return returnArgs.toArray(new String[0]);
    }
    static String[] getCommandNames(CommandLine parseResult) {
        List<String> returnList = new ArrayList<>();
        while (!parseResult.getCommandName().equals("liquibase")) {
            returnList.add(0, parseResult.getCommandName());