Ensure rabbitmqctl list_queues remains responsive during sync, and emit stats events too.
Shorter
Cancel sync
Fix accidental change
Emit an info item as soon as we start, for greater responsiveness.
merge bug24407 into bug25345
...and move Info{Push,Pull} into Args, where they belong
better fun names
oops
refactor: extract stop_syncer function
Merge in bug24407.
Merge default
Idempotence
merge default into bug25345
tweak: make use of rabbit_misc:rs/1
Fix docs and specs.
merge bug25345 into default
merge default into bug19375
tiny refactor