event registration doesn't respect reg end date

event online registration does not respect the registration end date. I suspect this is related to the work on https://issues.civicrm.org/jira/browse/CRM-15564 – it's unclear if that issue was actually resolved (it was reopened and later closed, but there is no second PR).

to reproduce:

• create an event with a future date
• enable online registration with a past end date
• open the event reg form

expected result: registration denied (past end date).
actual result: registration remains available.