LU-10181 tests: add FIO as test for DOM

LU-10181 tests: add FIO as test for DOM

Add FIO test for basic DOM performance tracking,
- remove unused smallfileio test,
- make parameter setting compatible with DNE,
- turn off extra stats output by default
- format test output

Test-Parameters: trivial mdssizegb=20 testlist=sanity-dom,dom-performance
Signed-off-by: Mikhal Pershin <mike.pershin@intel.com>
Change-Id: Id4236643e841165d35e7d3f0c1ab64ae8f9e1751
Reviewed-on: https://review.whamcloud.com/30059
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Jian Yu <jian.yu@intel.com>
Reviewed-by: Saurabh Tandan <saurabh.tandan@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>