LU-10181 mds: init cpt params for mdt IO service

LU-10181 mds: init cpt params for mdt IO service

Initialize CPT values for MDS IO service similar to
OST's values.

Test-Parameters: mdtcount=2 mdscount=2 mdssizegb=20 testlist=dom-performance
Signed-off-by: Mike Pershin <mpershin@whamcloud.com>
Change-Id: I96b5f78c7212d31d43ea1b7abd75000fb19beee9
Reviewed-on: https://review.whamcloud.com/31750
Tested-by: Jenkins
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Lai Siyao <lai.siyao@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>