test/vhost: remove fsync_on_close from fio job

Please see #3133 for details.

fsync_on_close in some cases calls actual fsync.
This does not work with SPDK fio plugins as they do not
open any files. Starting with fio-3.35 this error is now
propagated to fail the job.

As of right now, fsync_on_close should not be used with
fio SPDK plugins.
This particular job file was used test/vhost/shared/shared.sh,
where it will not work as SPDK virtio_blk does not support flush.

Signed-off-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
Change-Id: I66f2b7b9d0d9e04b5c01bda281344c0eb4e6c2cc
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/19930


Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Konrad Sztyber <konrad.sztyber@intel.com>
Reviewed-by: Michal Berger <michal.berger@intel.com>
Reviewed-by: Ben Walker <ben@nvidia.com>