Add undocumented options to keystoneauth sample config

[OpenStack Infra]

https://review.openstack.org/145266
commit fd8eb6b280ca15c0cfc9723c056cdac8548b34fd
Author: Alistair Coles <email address hidden>
Date: Tue Jan 6 16:57:17 2015 +0000

    Add undocumented options to keystoneauth sample config

    Adds is_admin and allow_overrides to the keystoneauth section
    of proxy-server.conf.sample and also adds related comments to
    the keystoneauth docstring.

    DocImpact

    Change-Id: I7c751880cb6742db7347f31c4d32b523e33da75b

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/166198

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/166198
Committed: https://git.openstack.org/cgit/openstack/openstack-manuals/commit/?id=48144c978120dbb51cebf2157e4bc1ed51cc7a9c
Submitter: Jenkins
Branch: master

commit 48144c978120dbb51cebf2157e4bc1ed51cc7a9c
Author: Maria Zlatkova <email address hidden>
Date: Fri Mar 20 14:31:09 2015 +0200

    Adds descriptions of options to proxy server config

    Adds is_admin and allow_overrides options description
     to the [filter-authtoken] table.
    Also adds missing descriptions of other options to
     the same table.

    Change-Id: I6dd8ceb18c593ecf327aab928f3e2ae4fff5ed97
    Closes-Bug: #1408381

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/openstack-manuals 15.0.0 release.