On centos pep8 must be latest

And a custom build located at ci-tools repo from this url:

http://danken.fedorapeople.org/python-pep8-1.4.5-2.el6.noarch.rpm

Change-Id: Iad552a76d351862d8057f544aa94dd8b53abbf30
Signed-off-by: David Caro <dcaroest@redhat.com>