rbd_mirroring_delete_delay not removing images with snaps

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We use the rbd-mirror as a way to migrate volumes between clusters.
The process is enable mirroring on the image to migrate, demote on the
primary cluster, promote on the secondary cluster, and then disable
mirroring on the image.
When we started using `rbd_mirroring_delete_delay` so we could retain a
backup of the source image, we noticed volumes with unprotected snaps do
not get purged from the trash. Previously, the image and all its snaps
would be successfully removed after disabling mirroring.
I would expect a similar function when using `rbd_mirroring_delete_delay`
as well. Is rbd trash just overly cautious here?

-- 
Tyler Brekke
Senior Engineer I
tbrekke@xxxxxxxxxxxxxxxx
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