bitbake: toaster: Prevent deprecation warnings for RedirectView

bitbake: toaster: Prevent deprecation warnings for RedirectView

The API for RedirectView is due to change in Django 1.9, which
means that Toaster generates deprecation warnings.

Set the "permanent" flag when constructing RedirectView instances
to prevent this warning.

[YOCTO #8364]

(Bitbake rev: 4aa09488bfe65cb365356b320cd9865643bb4fe5)

Signed-off-by: Elliot Smith <elliot.smith@intel.com>
Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com>
Signed-off-by: brian avery <avery.brian@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>