Comment 6 for bug 1753082

Reviewed: https://review.openstack.org/552100
Committed: https://git.openstack.org/cgit/openstack-dev/pbr/commit/?id=1fe0ceab39d47300d99b69b2ad3bbf87a4c61c08
Submitter: Zuul
Branch: master

commit 1fe0ceab39d47300d99b69b2ad3bbf87a4c61c08
Author: Stephen Finucane <email address hidden>
Date: Mon Mar 12 17:34:58 2018 +0000

    builddoc: Treat '[pbr] autodoc_tree_excludes' as a multi-line opt

    We were treating this a single line, comma- or space-delimited option.
    This was incorrect and was causing issues for projects like neutron-lib
    when Sphinx 1.7, which switches from optparse to the stricter argparse
    was used. In addition, this project was including comments in the
    multi-line opt. These were being passed through but Sphinx < 1.7 was
    simply ignoring them. These are now filtered out.

    Change-Id: I177edf0f44714175da220cf3a960b8f23aa4ab09
    Closes-Bug: #1753082