LU-7191 test: sanity 27z failed on DNE with ZFS

LU-7191 test: sanity 27z failed on DNE with ZFS

Because ZFS osd always use LPU64 as OST object name, sanity 27z
function check_seq_oid() should follow this semantic to check
obj, otherwise it will not find OST obj.

Signed-off-by: Lai Siyao <lai.siyao@intel.com>
Change-Id: I28f9a2db291f89c16bd142886c195da64c6817bb
Reviewed-on: http://review.whamcloud.com/16605
Tested-by: Jenkins
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Jian Yu <jian.yu@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>