cli, glusterd: Cleanup logging of bd op commands.

This patch prevents messages of the form "bd op: %s : SUCCESS"
from being logged in .cmd_log_history.

Change-Id: Iebeb7e26d409bf99b9c8df0a5c1c5a5d30d78a61
BUG: 823081
Signed-off-by: Vijay Bellur <vbellur@redhat.com>
Reviewed-on: http://review.gluster.org/4871
Reviewed-by: Krutika Dhananjay <kdhananj@redhat.com>
Reviewed-by: M. Mohan Kumar <mohan@in.ibm.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Anand Avati <avati@redhat.com>