documentation for using tox is missing libpq-dev

[Ruby Loo]

http://docs.openstack.org/developer/ironic/dev/dev-quickstart.html describes how to set up a developer environment. tox requires the postgresql libpq-dev package, so that ought to be added to the documentation.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/47413

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/47413
Committed: http://github.com/openstack/ironic/commit/76b81e1f267b6d1a52bdccb2a8b06da03ddcce62
Submitter: Jenkins
Branch: master

commit 76b81e1f267b6d1a52bdccb2a8b06da03ddcce62
Author: Ruby Loo <email address hidden>
Date: Thu Sep 19 14:01:56 2013 +0000

    Updates documentation for tox use

    In order to create a virtualenv with tox, a postgresql package is needed
    as a prerequisite. The dev-quickstart documentation has been updated to
    reflect this.

    In addition, the prerequisites for Fedora/RHEL were modified, because
    mysql-devel is needed, not mysql-libs.

    Fixes bug: #1227390

    Change-Id: Ibfdb0a9a3d560fcc3fb7d95aaa1d765ed18215e2