Cloud storage: make user visible messages more consistent

I hate this patch. But it makes no sense to expose users to git level
error messages. So this is trying to make things much easier (and,
frankly, less informative) if we are accessing the Subsurface cloud.

The way this is implemented is really ugly; it tries to avoid frequent
repetition of the same strings by using different exit points for the
functions in question. I'm not convinced this was the best way to do it
but it's what I have.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

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