* mirrors: Move tests to mirrors/tests
Move the tests to separate files in mirrors/tests and expand the model
tests with tests for the Mirror class.
* Add CheckLocation test
* mirrors: Add tests for template filters
Include tests for the filters used in the mirrors views.
* devel: Add tests for template filter in_group
Include a test for a simple case of the in_group filter.
Add a test for reporead import database functionality. Move tests for
devel to a separate directory and depend on mock for patching the
logging functonality. (Included by default in Python 3)