Implement scheduler hints for API v2

[Tom Fifield]

https://review.openstack.org/28945

Log:
commit db6d178a72989d979dbf42cb3b200e65a3afb1dd
Author: Nikolaj Starodubtsev <email address hidden>
Date: Thu Apr 18 16:42:35 2013 +0400

    Implement scheduler hints for API v2

    We've done this implementation because we need to use scheduler hint in
    cinder with some specific filters. So, most part of code have been
    imported from nova.

    bp scheduler-hints

See also https://review.openstack.org/#/c/28947/ for client patch

[Tom Fifield (fifieldt)]

To fix this bug, add the new --hint parameter to CLI documentation, and update the API reference adding the new parameter

[Stephen Gordon (sgordon)]

Looks like both the config-reference and cli-reference have picked this up. More interesting of course is exactly what hints the various filters pay attention to, but I believe those will come through as individual DocImpact bugs as they are added.