[IMPR] Improvements for match_images.py
[IMPR] Improvements for match_images.py

- remove Python 2 code
- simplify imageB.resize parameters
- simplify creating site object for other_family and other_lang
- simplify arg parsing

Change-Id: I19049a56ed47efb75dca979866dbeac98409ab09

wikimedia/pywikibot-core,wikimedia/pywikibot-core