xfs: online grow vs. log recovery stress test

xfs: online grow vs. log recovery stress test

fstests includes decent functional tests for online growfs and
shrink, and decent stress tests for crash and log recovery, but no
combination of the two. This test combines bits from a typical
growfs stress test like xfs/104 with crash recovery cycles from a
test like generic/388. As a result, this reproduces at least a
couple recently fixed issues related to log recovery of online
growfs operations.

Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Zorro Lang <zlang@redhat.com>
Signed-off-by: Zorro Lang <zlang@kernel.org>