check of extracting messages should be done in a part of Jenkins check

[Akihiro Motoki]

To avoid a bug like bug 1379054, it is better to add a check for extracting message catalogs.
It seems better to add this check to tox.ini pep8.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/127339

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/127339
Committed: https://git.openstack.org/cgit/openstack/horizon/commit/?id=b6857b5fa7bc2412b75f6136e966dfede83d5a8e
Submitter: Jenkins
Branch: master

commit b6857b5fa7bc2412b75f6136e966dfede83d5a8e
Author: Akihiro Motoki <email address hidden>
Date: Fri Oct 10 05:16:31 2014 +0900

    Add check for makemessages in tox.ini PEP8

    This commit adds a check of extracting message catalogs to
    tox PEP8 check. It is useful to avoid a bug like bug 1379054.

    It also fixes a warning "WARNING:root:No local_settings file found."
    in run_tests.sh --makemessages and --compilemessages by specifying
    Django settings.

    Closes-Bug: #1379507

    Change-Id: I5541e28a87d48601202bf8180a18eadb5a91770b