* Run no-unwanted-files sanity test only on Ansible.
Since collections should be able to use binary modules there is not really any limit on what could exist in a collection `plugins` directory.
* Add support for symlinks in sanity target lists:
- Sanity tests that need to analyze symlinks can do so using the supplied target list.
- Tests that analyze directories will now only look at symlinks if requested.
- Directory symlinks will now be seen as directories instead of files.
* Enable symlinks on filename based sanity tests.
Sanity tests that evalulate filenames instead of content should include symlinks.
* Update symlinks sanity test.
Use the sanity test target list now that it can include symlinks.
This will help prevent accidental merging of content to recently obsoleted directories when adding new files.
It may also help contributors who have modified obsolete files understand where their changes should now be made.
