perform more extensive checks on dryrun about btrbk HOT 3 OPEN

I'm afraid this is the expected behaviour. btrbk does not perform checks on the snapshot_dir, mainly because it can also be a regular directory, and then it will not show up on btrfs subvol list then. This would complicate things on ssh sources, so I decided not to implement checks on this.

Note that there are also other use cases where snapshot creation may fail, and as long as btrfs-progs does not provide a "dry-run" functionality itself, it is almost impossible to really check for all possible errors of the btrfs commands.

I've been thinking of implementing a "btrbk check" action which would do all kind of checking, but for now this is simply "functions as expected"...

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OK but should it not at least check for the exitense of it by doing a sinple ls or in some other way whether or not it's a subvolume would be irrelevant really just a though

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Originally, I wanted btrbk to depend only on the btrfs command (which makes it much easier to setup a chroot on ssh for example). As btrbk grows, I might need to change this, e.g. for a new "checkconfig" action.

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