views: Use context dictionaries in '__init__'

views: Use context dictionaries in '__init__'

Remove the use of PatchworkRequestContext in one function of this view
as it is not required and causes a 'RemovedInDjango110Warning' warning.
This requires the use of 'render', rather than 'render_to_response'.

The remaining use of this context option will be addressed in a
follow-up patch.

Signed-off-by: Stephen Finucane <stephen.finucane@intel.com>
Tested-by: Andy Doan <andy.doan@linaro.org>