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 we don't have access to that information at this point in time.
Merge pull request #2329 from chikoon/CLC-3487-see-viewed-first-login-in-footer

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