LU-11036 tests: debug information for sanity-lfsck test_8

LU-11036 tests: debug information for sanity-lfsck test_8

When test_8 fails, report lfsck status or recovery status
depending on the failure, to aid debugging.

Test-Parameters: trivial testlist=sanity-lfsck env=ONLY=8,ONLY_REPEAT=30
Test-Parameters: fstype=zfs testlist=sanity-lfsck env=ONLY=8,ONLY_REPEAT=30
Signed-off-by: Olaf Faaland <faaland1@llnl.gov>
Change-Id: I57ca069125f78e5dc10761a7b44b33a48ea4859c
Reviewed-on: https://review.whamcloud.com/39526
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Elena Gryaznova <elena.gryaznova@hpe.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>