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)


if (databaseClass == null) {
            Class clazz = LiquibaseCommandLineConfiguration.DATABASE_CLASS.getCurrentValue();
            if (clazz != null) {
                databaseClass = clazz.getName();
            }
        }
    }
    /**
     * Parses an option ("--someOption") from the command line
     *
     * @param arg the option to parse (including the "--")
     * @throws CommandLineParsingException if a problem occurs
     */
    private void parseOptionArgument(String arg, boolean okIfNotAField) throws CommandLineParsingException {
        final String PROMPT_FOR_VALUE = "PROMPT";
        if (arg.toLowerCase().startsWith("--" + OPTIONS.VERBOSE) ||
                arg.toLowerCase().startsWith("--" + OPTIONS.HELP)) {
            return;
        }
        if (arg.toLowerCase().equals("--" + OPTIONS.FORCE) || arg.toLowerCase().equals("--" + OPTIONS.HELP)) {
            arg = arg + "=true";
        }
        String[] splitArg = splitArg(arg);
        String attributeName = splitArg[0];
        String value = splitArg[1];
        if (PROMPT_FOR_VALUE.equalsIgnoreCase(StringUtil.trimToEmpty(value))) {
            Console c = System.console();
            if (c == null) {