[WFLY-3269] : XML parsing mandating the 'force' attribute on username-to-dn even though it has a default value.

Making force attribute optional with default value 'false' as it is defined in the XSD.

Jira: https://issues.jboss.org/browse/WFLY-3269
Yeah the actual formatting itself looks valid, it is just more of a case that we avoid reformatting whole files on each commit to avoid problems for other engineers working on the same file and merging between different branches.

Code with major formatting issues would be rejected at the code review stage but minor changes as identified here do creap in. (Or even during the build as checkstyle enforces a number of rules.)