ripple/fossil: ensure durability of add_path

sled doesn't actually promise not to eat your data until you invoke
flush. This is observable under normal circumstances as add_path
occasionally just not committing anything to the store.

While we're at it, ensure we're syncing the chunks file data to disk,
so the database *might* actually be consistent. We're not going for
full crash-correctness yet, mostly for performance and complexity
reasons.

Change-Id: I6cc69a013dc18cd50df26e73801b185de596565c

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