scripts/perf: Set nullglob, extglob in run_vhost_test

Do this to silence potential errors comming from a direct source
of test/vhost/common.sh.

Change-Id: Iad53981e3c01d8a7acf91e274ec289ca71b962d0
Signed-off-by: Michal Berger <michal.berger@intel.com>
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/21545


Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Konrad Sztyber <konrad.sztyber@intel.com>
Reviewed-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>