Remove the flake8 --repeat flag that it's not longer supported

Change-Id: Id327b718d0be945922d1a913da84edceb89bd644
Signed-off-by: Rosario Di Somma <rosario.disomma@dreamhost.com>
Merge pull request #15 from rodis/stable/folsom

Remove the flake8 --repeat flag that it's not longer supported