--changes-since is sending changes_since instead of changes-since

[Daniel Speichert]

`openstack server list --changes-since 2017-11-13T16:13:37Z`
is sending a query like:
GET /v2.1/b07d2688998e4a1c8alsk68776babfdd/servers/detail?changes_since=2017-11-13T16%3A13%3A37Z
note that "changes_since" has underscore.

Per https://developer.openstack.org/api-ref/compute/#list-servers, the valid query parameter is "changes-since" with a dash instead of underscore.

Obviously that makes this CLI parameter broken.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/519693
Committed: https://git.openstack.org/cgit/openstack/python-openstackclient/commit/?id=116526275d0953fda93c7ff8eacd8631c5af68d5
Submitter: Zuul
Branch: master

commit 116526275d0953fda93c7ff8eacd8631c5af68d5
Author: Daniel Speichert <email address hidden>
Date: Tue Nov 14 11:14:11 2017 -0500

    Send 'changes-since' instead of 'changes_since' query parameter

    Per API reference, only 'changes-since' is accepted and the variant
    with underscore is ignored, making the CLI functionality broken.

    [dtroyer] added release note and fixed unit tests.

    Change-Id: I0c596531a8af03da17d5ce39d75b12e941403aa5
    Closes-Bug: 1732216

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/python-openstackclient 3.13.0 release.