https://bugzilla.wikimedia.org/show_bug.cgi?id=71497
--- Comment #7 from Lokal_Profil lokal_profil@hotmail.com --- Sorry about that. Me getting confused between httplib and requests.
httplib2.CA_CERTS gives me /usr/local/lib/python2.7/dist-packages/httplib2-0.9-py2.7.egg/httplib2/cacerts.txt
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I finally got things to work by deleting the httplib2 directory in the externals folder of pywikibot.