DeprecationWarning: Using mimetype keyword argument is deprecated, use content_type instead

[Matthias Runge]

During test execution, the following messages pop up:

DeprecationWarning: Using mimetype keyword argument is deprecated, use content_type instead
WARNING:py.warnings:DeprecationWarning: Using mimetype keyword argument is deprecated, use content_type instead

This should be fixed, since that Django feature is deprecated and will break with Django-1.7

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/109540

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/109540
Committed: https://git.openstack.org/cgit/openstack/horizon/commit/?id=921d50f9c0839cb1998a5c1970f18436a4cad3e1
Submitter: Jenkins
Branch: master

commit 921d50f9c0839cb1998a5c1970f18436a4cad3e1
Author: Matthias Runge <email address hidden>
Date: Fri Jul 25 13:01:21 2014 +0200

    Replace mimetype argument name with content_type

    Change-Id: I11403772604bee1c98e2d3dfe81789d35bc01595
    Closes-Bug: #1348576