Add last login tracking

Add two api calls (/api/set_last_login and /api/get_last_login) to allow
centralized tracking of users last login.

Signed-off-by: shammash <shammash@autistici.org>
1 job for last_login in 15 seconds (queued for 1 second)
Status Name Job ID Coverage
  Test
passed test #6194

00:00:15