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)


final LiquibaseConfiguration liquibaseConfiguration = Scope.getCurrentScope().getSingleton(LiquibaseConfiguration.class);
                for (ConfigurationValueProvider provider : valueProviders) {
                    liquibaseConfiguration.unregisterProvider(provider);
                }
            }
        } catch (Throwable e) {
            handleException(e);
            return 1;
        } finally {
            cleanup();
        }
    }
    private boolean wasHelpOrVersionRequested() {
        CommandLine.ParseResult parseResult = commandLine.getParseResult();
        while (parseResult != null) {
            if (parseResult.isUsageHelpRequested() || parseResult.isVersionHelpRequested()) {
                return true;
            }
            parseResult = parseResult.subcommand();
        }
        return false;
    }
    protected String[] adjustLegacyArgs(String[] args) {
        List<String> returnArgs = new ArrayList<>();
        final ListIterator<String> iterator = Arrays.asList(args).listIterator();
        while (iterator.hasNext()) {
            String arg = iterator.next();
            String argAsKey = arg.replace("-", "").toLowerCase();
            if (arg.startsWith("-")) {
                returnArgs.add(arg);