final pep8 v1.4.6 fixes

This commit makes pywikibot/core to pass the pep8 checks as of version
1.4.6.  I have asked that version to be made available so we can deploy
it on the Jenkins server, once done, I guess we can cause pep8 to block
changes :)

Change-Id: I38b5499f464dbe5375b9aa130d46c200438f4800