rbd: document rbd_spec structure

I promised Josh I would document whether there were any restrictions
needed for accessing fields of an rbd_spec structure.  This adds a
big block of comments that documents the structure and how it is
used--including the fact that we don't attempt to synchronize access
to it.

Signed-off-by: Alex Elder <[email protected]>
Reviewed-by: David Zafman <[email protected]>
Reviewed-by: Josh Durgin <[email protected]>

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