Comment 2 for bug 1832225

Reviewed: https://review.opendev.org/664257
Committed: https://git.openstack.org/cgit/openstack/neutron-vpnaas/commit/?id=183934eae66d8a411b8f2d7f7cb00ebbc4152d7c
Submitter: Zuul
Branch: master

commit 183934eae66d8a411b8f2d7f7cb00ebbc4152d7c
Author: Slawek Kaplonski <email address hidden>
Date: Mon Jun 10 15:13:54 2019 +0200

    Fix missing "is_sort_key" for basic vpnaas attributes

    Patch [1] introduced need to explicity set with "is_sort_key"
    flag to attributes which attribute can be used as sort key.
    This patch adds it to base attributes in vpnaas resources, like:
    * id,
    * tenant_id,
    * name,
    * subnet_id,
    * router_id

    This commit also updates sphinx requirements to make requirements
    jobs passing.

    [1] https://review.opendev.org/#/c/653903/

    Change-Id: Ibe1aee0346e3fc21215d1b3be8752224aa2c162d
    Closes-Bug: #1832225