Added ci-tools repo with latest pep8

Epel does not have a new enough pep8 version for EL hosts, added the
package to the repo and the repo to centos slaves.

Forcing also repos to be configured before packages

Change-Id: Ie979aefc7e63380f15b35ee3b4e017e3f5747eee
Signed-off-by: David Caro <dcaroest@redhat.com>