Correct LOG.warning in persistence utils
Correct LOG.warning in persistence utils

Change-Id: Ibfd0bd8ce452810161d25d3ac5441eb9ed1e0e13

openstack/taskflow,pombredanne/taskflow-1,pombredanne/taskflow-1,junneyang/taskflow,junneyang/taskflow,jimbobhickville/taskflow,openstack/taskflow,jimbobhickville/taskflow