Revert commit ac32d43d - "Make block-dedupe the default"
This is resulting in too much meta data fragmentation on the users end. This sometimes pushes us into negative space savings - definitely not something users expect from their dedupe tool. So revert the default back to our extent search algorithm. Block dedupe is still there in case there is a use for it. Signed-off-by: Mark Fasheh <email@example.com>
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