libbe: attempt to remove autocreated mountpoints at unmount time
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Authored by kevans on Oct 17 2023, 12:57 AM.

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Summary

We use a be_mount.XXXX pattern to mkdtemp(3) when creating these, which
seems reasonably unique enough to just continue using that. Record the
mountpoint of the root dataset and check the dirname of that for the
auto-creation trait. There's no sense in this bubbling up an error to
callers, so we'll just ignore an error for now.

Requested by: manu