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Temporarily disable Direct IO by default

Description

Temporarily disable Direct IO by default

While some remaining issues are resolved with the recently merged
Direct IO functionality disable it by default.

Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Signed-off-by: Brian Atkinson <batkinson@lanl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #16597