Made all Python files executable

Tobias Mueller requested to merge gh-eb66e79e/1/muelli/rpmlint into master

Created by: muelli

It seems to upset rpmlint to have files with a shebang. The shebang doesn't make much sense if the file is not marked as executable. Now you could also remove the shebang, but then some editors (most importantly: mine) uses the shebang to detect what file type is being edited. To make both me and rpmlint happy, we now mark the files as executable.

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