Make pep8 *the* linting interface
Make pep8 *the* linting interface

According to the PTI (=Python Test Interface,
http://governance.openstack.org/reference/cti/python_cti.html), pep8
is the interface for codestyle checks. Move all tests from linters to
pep8.

This change will be followed by a change to project-config to use pep8
for testing in the gate.

Change-Id: I1a48f4b1e0b0950640192bcfc55121619a844b50

toby82/kolla,mandre/kolla,intel-onp/kolla,dardelean/kolla-ansible,negronjl/kolla,stackforge/kolla,toby82/kolla,stackforge/kolla,stackforge/kolla,tonyli71/kolla,dardelean/kolla-ansible,coolsvap/kolla,nihilifer/kolla,GalenMa/kolla,mrangana/kolla,toby82/kolla,coolsvap/kolla,dardelean/kolla-ansible,mandre/kolla,intel-onp/kolla,negronjl/kolla,openstack/kolla,nihilifer/kolla,coolsvap/kolla,GalenMa/kolla,rahulunair/kolla,openstack/kolla,rahulunair/kolla,mrangana/kolla,negronjl/kolla,tonyli71/kolla,mandre/kolla