Admins, when Viewing As, should see the pseudo-user's first log-in status in the view-as footer

https://jira.ets.berkeley.edu/jira/browse/CLC-3487

The title of this jira has been changed. It used to say "should see the pseudo-user's last log-in status in the view-as footer", but that was misleading because  we don't have access to that information at this point in time.

What's really being shown is the date of the user's first log in.