test/vmd: fixed fio's configuration

The config had a 'verify=1' which doesn't make sense as the verify
option requires the type of verification to be set (e.g. md5, crc32c).

Change-Id: I0ace5bce86ce3e78d0f58a74edeb314e5d38bdc6
Signed-off-by: Konrad Sztyber <konrad.sztyber@intel.com>
Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/470662
Reviewed-by: Wojciech Malikowski <wojciech.malikowski@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>

test/vmd/config/config.fio

@@ -3,7 +3,8 @@ ioengine=spdk
 thread=1
 group_reporting=1
 direct=1
-verify=1
+verify=md5
+do_verify=1
 time_based=1
 ramp_time=0
 runtime=2