Replace DP "is_alive" check with a BAC; change link to POST #1517
Description
The page that allows an admin to trigger a set of live 'is_alive?' checks on the DPs, from the perspective of any portal or bourreaux, has two issues.
- the link to trigger a refresh of the table is done with GET requests instead of POST
- the code that is triggered is a loop within the old spawn_with_active_records() utility, which should be replaced by a BackgroundActivity object instead.