pep8: Add non .py sources to PEP8_WHITELIST

Change-Id: Ic84d0acb47766ed3c433e06589114daca93083a5
Signed-off-by: Dima Kuznetsov <dkuznets@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/27972
Reviewed-by: Dan Kenigsberg <danken@redhat.com>