(bug 55584) only install pywikibot.*

After hitting setuptools with a hammer in the right places, this
seems to be the best way of doing it. The alternative is listing
packages manually (['pywikibot', 'pywikibot.comms', ...]) or
having a huge exclude list (['tests', 'tests.*', ...]).

Change-Id: Ie1dd6b6e5558edd48b6a1a2fef96b665f7339b78
Merge "(bug 55584) only install pywikibot.*"