[issue15083] Rewrite ElementTree tests in a cleaner and safer way

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

It is hard to backport bugfixes to 2.7 since tests are too different. Due to this I backported some bugfixes without tests and omitted backporting other bugfixes.

PR 906 converts doctests in 2.7 to unittests. This will help backporting bugfixes too much.

Actually I have backported tests from 3.5 and checked that all old tests are present in new tests. Perhaps I found a bug in ElementTree in 2.7. Will open an issue after merging tests.

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