Automatic “localization”. E.g. support for functional tests (not just classes)

[akellehe]

Currently tests have to be 'localized' by finding the module defining the test case instance where the tests are defined.

https://github.com/buzzfeed/caliendo/blob/master/caliendo/patch.py#L137-139

Provide an alternative solution that will work for functional tests that doesn't alter the call signatures to caliendo.patch.patch