[issue30365] Backport warnings in ElementTree/cElementTree modules and fix bugs

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

getchildren() and getiterator() were deprecated in Python implementation for years (since updating to ElementTree 1.3 in Python 2.7 and 3.2). And they are documented as deprecated. Just C implementation didn't emit warnings. It may be too late to add unconditional deprecation warnings, but we can add them as Py3k warnings.

I'm going to remove these deprecated methods in 3.8.

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