fixed #1464 - change so persistence dir is only backed up if node is HA ...

...master or HA disabled; handles the case of HA autodetect selecting master hence the complexity.

also fixes some leaks in test and improves atomic file update support in FileBasedObjectStore.
(incorporates new logging from #1469)
Is this comment still relevant? I thought that was fixed by the other commits, so the standby node will not copy the directory.

Can we either bump up the invocationCount, and mark as "WIP"?
Or at least have a TODO.