[test] enable -help test for imageharvest
[test] enable -help test for imageharvest

- enable -help test for imageharvest but there is a remaining failure
  for -simulate the script (T167726)
- enable -help tests for isbn and weblinkchecker scripts
- some lists are convered to sets
- some dependencies are updated

Bug: T193973
Change-Id: Ib2326d77fa92767a0cab582da396fdd6b0623140

wikimedia/pywikibot-core,PersianWikipedia/pywikibot-core,wikimedia/pywikibot-core