Check behaviour of old existing recovery dir

[infeo]

In 6a905dc0c24d7488eef50c3bdf42648f6f726f21 the name of the recovery dir was changed.

For a vault with an already existing old recovery dir, applying an orphan dir fix would create a new directory with the same dirId, effectivley linking two dirs together.

This is a rare edge case, nonetheless the effects should be investigated.