[Bug 217261] sys/aio/aio_test:aio_md_test fails semi-frequently with Jenkins with "aio_write failed: Operation not supported"

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=217261

--- Comment #8 from commit-hook at freebsd.org ---
A commit references this bug:

Author: ngie
Date: Thu May 11 08:06:47 UTC 2017
New revision: 318180
URL: https://svnweb.freebsd.org/changeset/base/318180

Log:
  Mark all md tests as requiring unsafe AIO in order to function

  These tests have been flapping (failing<->passing) on Jenkins for months.
  It passes reliably for me if unsafe AIO is permitted, but it doesn't
  pass on Jenkins reliably if unsafe AIO is disabled (the current default).

  Mark the tests as requiring unsafe AIO to mitigate the intermittent
  failures when unsafe AIO isn't permitted. If the kernel code is changed
  to reliably function with md(4) devices using unsafe AIO, this commit can
  be reverted.

  MFC after:    2 months
  PR:           217261
  Reported by:  Jenkins
  Sponsored by: Dell EMC Isilon

Changes:
  head/tests/sys/aio/aio_test.c

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