Added the possibility to define additional sudoers files.

[tobiicerb]

This is helpful as the option purge_other_sudoers_files would also delete our added configuration if we would run the role multiple times.

It works by adding a suffix to the existing variables, for example if you add

     - web

Then one variable to configure this file would look like this:

     - name: www-html

The changes will work with the current master branch, but also together with #36 or #37

[tobiicerb]

I just realized that I made a mistake. The alias configurations don't work with additional files at the moment. I will need to investigate why.

[tobiicerb]

I just realized that I made a mistake. The alias configurations don't work with additional files at the moment. I will need to investigate why.

I fixed the problem inside the other branches. The issue was not caused by this branch.