disable log output when needed.
disable log output when needed.

vim ping action is in a tight loop, too disable log
is a must to avoid CPU and IO comsumption.

Change-Id: Ie5974541f03b41db04b47700bfafed7c023862f3
Closes-bug: #1702575

openstack/tacker,openstack/tacker,stackforge/tacker,stackforge/tacker,openstack/tacker