Add autofix where possible

[maratori]

Need to suggest fixes.
Fix is a code refactoring, so:

1. It must not break code
2. It should not be suggested, if non-breaking change is not possible

For example it's not possible to suggest fix, if test uses private entities from original package.

It isn't enough just to replace pkg -> pkg_test.
At least need to change imports as well.

Also it's better to avoid dot import if possible.