Fix inability to log out from NOS as a customer

As user 1
Login to NOS
Attempt to logout
=> you are logged back in

Expected:

• logout should work

go to auth.nuxeo.com and logout from there
=> you are logged out
Login to NOS as user 2
=> you are logged in as user 1

Expected:

• when logging in, the appropriate user account should be used

Logout
=> you are logged in as user 2