[consensus] small clean-up on Log
[consensus] small clean-up on Log

This patch doesn't contain any functional modifications.

Change-Id: I574543a0f98871f6b66b8ddf578bd10bd3f7d98c
Reviewed-on: http://gerrit.cloudera.org:8080/16061
Tested-by: Kudu Jenkins
Reviewed-by: Bankim Bhavsar <3aac13853bde1b179487acd91435d1ded94913cb@cloudera.com>

helifu/kudu,helifu/kudu,helifu/kudu,helifu/kudu,helifu/kudu,helifu/kudu,helifu/kudu,helifu/kudu,helifu/kudu