"tox -e pep8" unnecessarily uses bash

[YAMAMOTO Takashi]

sh is hopefully more ubiquitously available than bash.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/129120

[Armando Migliaccio (armando-migliaccio)]

and where would that a problem in practice?

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/129120
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=9ffa8bd9e7ecc3de8301d8854316c01e1e55e0dd
Submitter: Jenkins
Branch: master

commit 9ffa8bd9e7ecc3de8301d8854316c01e1e55e0dd
Author: YAMAMOTO Takashi <email address hidden>
Date: Fri Oct 17 12:30:38 2014 +0900

    tox.ini: Avoid using bash where unnecessary

    Switch to sh, which is hopefully more ubiquitously available than bash.

    A recent change (commit 085a35d657cf0fa41a402f2af66c4beaa0f60db2)
    introduced bash dependency for "tox -e pep8". It broke my environment,
    where bash is not available. This change aims to restore it.
    As far as I undestand, the change in question doesn't actually need
    the specific shell dialect. So switch to sh, which is expected to be
    available for any POSIX-like systems, would improve the situation.

    Closes-Bug: #1382327
    Change-Id: Ie023d2265d9949a3e3721f03e865e4acfb460de2