Allow -1 as the length of "get console output" API

[OpenStack Infra]

https://review.openstack.org/81947
commit 8e5577f52f660960738f1fc0384dff77fa30fc8a
Author: Ken'ichi Ohmichi <email address hidden>
Date: Thu Apr 10 20:46:13 2014 +0900

    Allow -1 as the length of "get console output" API

    Current "get console output" API does not allow -1 as the length and
    returns a BadRequest response if receiving it. The other APIs(quota)
    considers -1 as an unlimited value.
    This patch allows -1 as the length for API consistency.

    DocImpact

    Change-Id: Idf88a238d1b0e545ebab5be872269b1b1030cc56
    Related-Bug: #1295426

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/204961

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/204961
Committed: https://git.openstack.org/cgit/openstack/api-site/commit/?id=6ff3d6ef9be21129ed6e051d88ac3e6d8d0a78d0
Submitter: Jenkins
Branch: master

commit 6ff3d6ef9be21129ed6e051d88ac3e6d8d0a78d0
Author: Hironori Shiina <email address hidden>
Date: Thu Jul 23 07:12:07 2015 +0000

    Allow -1 as the length of "Servers console output" API

    "Servers console output" API allows -1 as the length parameter for indicating
    an unlimited value.

    Change-Id: I6f874e440ffb63c4f1b4f05239c0fb172a2b3707
    Closes-Bug: 1307751