use a django form

[Matthias Runge]

https://github.com/openstack/horizon/blob/master/openstack_dashboard/dashboards/admin/metering/templates/metering/stats.html

uses a hard coded form, but should rather use django forms.
There's no real security check, csrf protection, etc.

[Matthew D. Wood (woodm1979)]

Also happens in:
https://github.com/openstack/horizon/blob/master/openstack_dashboard/dashboards/admin/metering/templates/metering/daily.html

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/107011

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/107011
Committed: https://git.openstack.org/cgit/openstack/horizon/commit/?id=ca2e10c3e8efa6d5ae07a04ea0cd6a029dad7319
Submitter: Jenkins
Branch: master

commit ca2e10c3e8efa6d5ae07a04ea0cd6a029dad7319
Author: Matthias Runge <email address hidden>
Date: Tue Oct 14 11:26:42 2014 +0200

    Refactor metering dashboard

    - check date range for validity
    - use django forms
    - treat times according to users timezone

    Change-Id: I68182ddb4b00d19e54011722ebc770d9aa8e725c
    Closes-bug: #1331427
    Closes-bug: #1331434
    Closes-bug: #1288512