LU-5023 tests: check FID seq properly for sanity-lfsck t_11b

LU-5023 tests: check FID seq properly for sanity-lfsck t_11b

To guarantee the right FID seq to be checked.

Other scripts improvement for error handling.

Try to collect more logs.

Signed-off-by: Fan Yong <fan.yong@intel.com>
Change-Id: I51cb75c15cc7421721ea0bc149fc2a5a72c13cc6
Reviewed-on: http://review.whamcloud.com/10276
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Jian Yu <jian.yu@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Lai Siyao <lai.siyao@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>