Comment 7 for bug 1403510

Reviewed: https://review.openstack.org/142561
Committed: https://git.openstack.org/cgit/openstack-dev/pbr/commit/?id=65f4fafd907a16ea1952ab7072676db2e9e0c51d
Submitter: Jenkins
Branch: feature/0.10

commit 65f4fafd907a16ea1952ab7072676db2e9e0c51d
Author: Doug Hellmann <email address hidden>
Date: Wed Dec 17 14:26:03 2014 -0500

    Only import sphinx during hook processing

    When pbr is imported to handle writing the egg_info file because of
    the entry point, it's causing sphinx to get imported. This has a
    cascading effect once docutils is trying to be installed on a
    system with pbr installed. If some of the imports fail along the way,
    allow pbr to continue usefully but without the Sphinx extensions
    available. Eventually, when everything is installed, those extensions
    will work again when the commands for build_sphinx, etc. are run
    separately.

    Also slip in a change to reorder the default list of environments run by
    tox so the testr database is created using a dbm format available to all
    python versions.

    Change-Id: I79d67bf41a09d7e5aad8ed32eaf107f139167eb8
    Closes-bug: #1403510