Convert XML configurations to Java-based configurations (all easy cases)

[Akvel]

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https://github.com/spring-projects/spring-ldap/issues/588

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[jzheaux]

Hi, @Akvel. I'm not clear on what the PR is trying to accomplish. Is the goal to replace the XML config with Java config and change the tests to use the Java config? Is it to introduce new tests that confirm the functionality using Java config while still keeping the XML config?