pep8: do not test locale files

Do not test locale files (*.po,*.pot). They currently test the new
log level locale files, see https://review.openstack.org/#/c/97005/
and fail.

implements bp log-messages-translation-domain-rollout

Co-Authored-By: Brant Knudson <bkundson@us.ibm.com>

Change-Id: Icb6ff973636a8d7e39abd4d1578dcea65d998e09
Merge "pep8: do not test locale files"