cli: .cmd_log_history should not be hidden

Change-Id: I4513a2c260530855e09be64083e9344108c7a6c0
BUG: 1165996
Signed-off-by: Atin Mukherjee <amukherj@redhat.com>
Reviewed-on: http://review.gluster.org/9150
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Kaushal M <kaushal@redhat.com>