http.py: Show a more descriptive warning about invalid authentication tokens
http.py: Show a more descriptive warning about invalid authentication tokens

Bug: T173498
Change-Id: I1c1e69ef97d1aebfc591ad58ed28f6394bcd4557

wikimedia/pywikibot-core,happy5214/pywikibot-core,happy5214/pywikibot-core,wikimedia/pywikibot-core,magul/pywikibot-core,magul/pywikibot-core,PersianWikipedia/pywikibot-core