scripts/vhost: Modify parameters for vhost benchmark job.

Add missing parameter numjobs. It is used in one of the cases.
Remove unnecessary arguments:
- cpumask: we do not want to restrict that
- percentile list: we do not want to restrict that, all
  percentule buckets can be generated.

Change-Id: I6a4431af0defe92920f16d26091d67161e56dc5a
Signed-off-by: Karol Latecki <karol.latecki@intel.com>
Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/450519
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Darek Stojaczyk <dariusz.stojaczyk@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>

scripts/perf/vhost/fio_test.conf

@@ -5,8 +5,6 @@ group_reporting=1
 direct=1
 verify=0
 norandommap=1
-cpumask=1
-percentile_list=50:90:99:99.5:99.9:99.99:99.999
 
 [perf_test]
 stonewall
@@ -18,4 +16,5 @@ iodepth={iodepth}
 time_based=1
 ramp_time={ramptime}
 runtime={runtime}
+numjobs={numjobs}
 filename=

scripts/perf/vhost/run_vhost_test.py

@@ -133,6 +133,8 @@ parser.add_argument('rw', default="randread", type=str,
                     help="RW param for FIO. Default: randread")
 parser.add_argument('-m', '--rwmixread', default="70", type=str,
                     help="Percentage of reads in read-write mode. Default: 70")
+parser.add_argument('-n', '--numjobs', default="1", type=str,
+                    help="Numjobs value for FIO job. Default: 1")
 parser.add_argument('-r', '--runtime', default="10", type=str,
                     help="Run time param for FIO (in seconds). Default: 10")
 parser.add_argument('-R', '--ramptime', default="10", type=str,