Updated openstack/openstack
Project: openstack/horizon  16ef57c94bd6f593d2e995039f8642aae2ec009e

Change django message storage backends default.

Due to original cookie storage backends have limit 2048 bytes,
change it to fallbackstorage, which could store extra message in
session storage.

Related django storage illustration
https://docs.djangoproject.com/en/1.6/ref/contrib/messages/#module-django.contrib.messages

Closes-Bug: #1168541
Change-Id: Ieed4db962ccdadcb346c8ca7e6e789766f9838e5