LU-4441 test: improve run-llog.sh to print more information

LU-4441 test: improve run-llog.sh to print more information

Improve run-llog.sh script so that it can print more useful
information when "Module llog_test is in use" happens again.

This is a backport to b2_5.
Lustre-change: http://review.whamcloud.com/9966
Lustre-commit: 5d8de1fabf740eda724ad2e9eb40c3b57322b9e4

Signed-off-by: Emoly Liu <emoly.liu@intel.com>
Change-Id: I15594f34f26550204b525d8f532fd064f30d00a4
Reviewed-on: http://review.whamcloud.com/11573
Reviewed-by: Jian Yu <jian.yu@intel.com>
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>