Description of problem:

I opened a browser with two tabs both for openstack dashboard. 
in one session I logged in with user admin -> moved to the volumes tab under project view
In the second session I logged in with a different user for a different tenant. 

I went back to the first session and pressed the create volume button and created a volume. 
the volume that was created was created with the second user on the second tenant (from the second tab)

Version-Release number of selected component (if applicable):

python-django-horizon-2013.1.2-1.el6ost.noarch

How reproducible:

100%

Steps to Reproduce:
1. create a tenant and a user with member permissions of the tenant
2. open firefox with two tabs pointing on openstack dashboard. 
3. in the first tab, log in as user admin -> in project view select volumes tab
4. in the second firefox tab, login with the new user
5. go back to the first firefox tab (one with admin login) -> create new volume 

Actual results:

we are creating a new volume but its created under the second tenant (the one we logged into in the second tab) and not under the admin tenant. 

Expected results:

if we ran over the cookies and are now logged in under a different user we should redirect to the main login page and not create a new object. 

Additional info: