[issue36824] Refactor str tests to reflect that str and unicode are merged in Python 3

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

There is still the functionality common to str, bytes and bytearray. So it make sense to have the common class for testing str, bytes, bytearray and UserList and other common class (subclass of the former one) for testing str and UserList.

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nosy: +serhiy.storchaka

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