Comment 4 for bug 1691129

Reviewed: https://review.openstack.org/465489
Committed: https://git.openstack.org/cgit/openstack-dev/pbr/commit/?id=c02406601a7d7c453c77318ff5b5af6d760e80ae
Submitter: Jenkins
Branch: master

commit c02406601a7d7c453c77318ff5b5af6d760e80ae
Author: Julien Danjou <email address hidden>
Date: Wed May 17 12:05:59 2017 +0200

    builddoc: uses the new Sphinx 1.6 code for multiple builder

    As noted by stephenfin, Sphinx 1.6 provides its own code to build doc with
    multiple builders. The one provided by pbr so far for Sphinx < 1.6 is not even
    compatible with 1.6. This patch fixes that by running the native Sphinx code
    for Sphinx > 1.6 and falling back to the old code for older Sphinx versions.

    Closes-Bug: #1691129
    Change-Id: I5224235b1056a248b246c54e2d99eea94d53c4eb