Run given fio config in loop X times. We use that later to calculate the average of runs. Previously the loop was done in CI but it's better to do this in script. Change-Id: Ie4126f504b2c027a1d6b4b4520152e89aadb4794 Signed-off-by: Karol Latecki <karol.latecki@intel.com> Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/450946 Reviewed-by: Jim Harris <james.r.harris@intel.com> Reviewed-by: Darek Stojaczyk <dariusz.stojaczyk@intel.com> Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>