[sheepdog] [PATCH 4/4] dog: make repairing vdi optional

[Valerio Pachera]

Sorry guys if I intrude in this list.

In my opinion, form user point of view, it would be nice to have a
"read only" check that could be run with a running vm.
In case problems are reported, then the user could shutdown the guest
when he can, and run the check "read write" (auto repair).

Similar to
xfs_check -n <device>  (no repair)
xfs_check <device> (repair)

>From user point of view, existence/inode/consistency/relation, maxes
no difference.
You may create such sub command but keep them "hidden" for developer
use or advanced diagnostic.

This is only to give my point of view, but do what you consider best
for the project.