LU-11025 tests: only set crush for newer builds

LU-11025 tests: only set crush for newer builds

Don't set default DNE hash type to crush if MDS doesn't support it.

Test-Parameters: trivial
Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: I1c91f1149d9472bbe1f30ce3f01565835ed7ab01
Reviewed-on: https://review.whamcloud.com/38107
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: Lai Siyao <lai.siyao@whamcloud.com>
Reviewed-by: Sergey Cheremencev <sergey.cheremencev@hpe.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>