Comment 1 for bug 1212405

I get a 500 by logging in on Horizon commit 11dff26cec32a7c77c2c19a31a46fbcb32324843 and then switching to commit 7e7965f875c01ef7e23c7910ea87765f861b571f. It's strange that this would be happening on the gate though, since I wouldn't expect sessions to persist between jobs...

Proposed a change to revert 11dff26cec32a7c77c2c19a31a46fbcb32324843 to see if it fixes things:

https://review.openstack.org/#/c/42033/