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)


* enough
     *
     * @param outputLoggingEnabled if a warning should be printed
     * @return the warning message (if outputLoggingEnabled==true), an empty String otherwise
     */
    private static String generateLogLevelWarningMessage(boolean outputLoggingEnabled) {
        if (outputLoggingEnabled) {
            return "";
        } else {
            return "\n\n" + coreBundle.getString("for.more.information.use.loglevel.flag");
        }
    }
    /**
     * Splits a String of the form "key=value" into the respective parts.
     *
     * @param arg The String expression to split
     * @return An array of exactly 2 entries
     * @throws CommandLineParsingException if the string cannot be split into exactly 2 parts
     */
    
    @SuppressWarnings("squid:S109")
    private static String[] splitArg(String arg) throws CommandLineParsingException {
        String[] splitArg = arg.split("=", 2);
        if (splitArg.length < 2) {
            throw new CommandLineParsingException(
                    String.format(coreBundle.getString("could.not.parse.expression"), arg)
            );
        }
        splitArg[0] = splitArg[0].replaceFirst("--", "");
        return splitArg;