LU-14912 obdclass: prefer T10 checksum if the target supports it

LU-14912 obdclass: prefer T10 checksum if the target supports it

If the target actually has T10PI support, we prefer to use that
T10 checksum even it's not the fastest on the client, given
checksum_type is not explicitly set.

Change-Id: If91217881fcadbc84d1e360e65648344f5ac2447
Test-Parameters: trivial
Signed-off-by: Li Dongyang <dongyangli@ddn.com>
Reviewed-on: https://review.whamcloud.com/44657
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Li Xi <lixi@ddn.com>