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 (LiquibaseCommandLineConfiguration.INCLUDE_SYSTEM_CLASSPATH.getCurrentValue()) {
            classLoader = AccessController.doPrivileged((PrivilegedAction<URLClassLoader>) () -> new URLClassLoader(urls.toArray(new URL[0]), Thread.currentThread()
                    .getContextClassLoader()));
        } else {
            classLoader = AccessController.doPrivileged((PrivilegedAction<URLClassLoader>) () -> new URLClassLoader(urls.toArray(new URL[0]), null));
        }
        Thread.currentThread().setContextClassLoader(classLoader);
        return classLoader;
    }
    private void addSubcommand(CommandDefinition commandDefinition, CommandLine rootCommand) {
        List<String[]> commandNames = expandCommandNames(commandDefinition);
        boolean showCommand = true;
        for (String[] commandName : commandNames) {
            final CommandRunner commandRunner = new CommandRunner();
            final CommandLine.Model.CommandSpec subCommandSpec = CommandLine.Model.CommandSpec.wrapWithoutInspection(commandRunner, defaultFactory);
            commandRunner.setSpec(subCommandSpec);
            configureHelp(subCommandSpec, false);
            String shortDescription = commandDefinition.getShortDescription();
            String displayDescription = shortDescription;
            String legacyCommand = commandName[commandName.length-1];
            String camelCaseCommand  = StringUtil.toCamelCase(legacyCommand);
            if (! legacyCommand.equals(camelCaseCommand)) {
                displayDescription = "\n" + shortDescription + "\n[deprecated: " + camelCaseCommand + "]";
            }
            subCommandSpec.usageMessage()
                    .header(StringUtil.trimToEmpty(displayDescription) + "\n")
                    .description(StringUtil.trimToEmpty(commandDefinition.getLongDescription()));
            subCommandSpec.optionsCaseInsensitive(true);
            subCommandSpec.subcommandsCaseInsensitive(true);
            if (!showCommand) {