Comment 2 for bug 1649079

Reviewed: https://review.openstack.org/409515
Committed: https://git.openstack.org/cgit/openstack/neutron-lib/commit/?id=322ae30246d21d154b44b90e12ecf5506ae4ed68
Submitter: Jenkins
Branch: master

commit 322ae30246d21d154b44b90e12ecf5506ae4ed68
Author: YAMAMOTO Takashi <email address hidden>
Date: Sun Dec 11 21:29:21 2016 +0900

    Use constranits for api-ref target

    It should be ok to use zuul-cloner these days. [1]
    This would avoid docutils 0.13.1, which seems to cause the following
    TypeError.

        Exception occurred:
          File "/home/jenkins/workspace/gate-neutron-lib-api-ref/.tox/api-ref/local/lib/python2.7/site-packages/docutils/writers/html4css1/__init__.py", line 288, in write_colspecs
            width += node['colwidth']
        TypeError: unsupported operand type(s) for +=: 'int' and 'str'

    [1] I8f45a53429b9fcbf3689a268f096afdf5f32f461

    Closes-Bug: #1649079
    Change-Id: Id75e88f5031aeab21b2158c721881bf2da4a0d28