[opensuse-python] Issues with backporting mock 4.x to SLE-12

Hi!

For updating the Azure SDK in SLE-12, I need to backport mock 4.x to SLE-12.

Unfortunately, mock 4.x introduced a number of changes such as f-strings and async calls which are not compatible with Python 3.4 [1].

I have been able to patch out the f-strings (see attached patch), but I'm not sure I can get rid of the async code without breaking mock.

Does anyone have a suggestion how to get mock 4.x to build in SLE-12?

Adrian

[1] https://github.com/testing-cabal/mock/commit/ce5b6961d0b38b9f26e6bffabf46fad...