Sam 44cf3cf975 FIX: queue heartbeats in readonly modes ...

If sidekiq is paused or Discourse is in readonly continue to queue
heartbeats

If we do not do that then a master process can end up reaping sidekiq
workers and causing various badness

This also impacts restore which can do weird stuff TM in cases like this

2018-08-29 12:36:59 +10:00

..

pausable.rb

FIX: queue heartbeats in readonly modes

2018-08-29 12:36:59 +10:00