LU-4724 hsm: Safe copytool event logging

Protect against concurrent event log writes by multiple
threads within a copytool process. Fixes sanity-hsm test_71
failures.

Signed-off-by: Michael MacDonald <michael.macdonald@intel.com>
Change-Id: Ie18f7368f386acf0949a038e6bdb2ba7dca5c3a3
Reviewed-on: http://review.whamcloud.com/9553
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Jinshan Xiong <jinshan.xiong@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
LU-4643 hsm: Improve sanity-hsm test_60

Small fix to further reduce the chance of false failures.
Also cleans up example HSM events in comments to address style
warnings.

Signed-off-by: Michael MacDonald <michael.macdonald@intel.com>
Change-Id: Icecb69ddc417cd33f80b38c9df623ac5fc0cc466
Reviewed-on: http://review.whamcloud.com/9534
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Reviewed-by: Jian Yu <jian.yu@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>