Decrease extraneous logging
Decrease extraneous logging

This log statement isn't very useful, and is a very active logging
statement used when no backend is provided, to avoid spewing to much
useless information into logs just remove it.

Fixes bug 1295880

Change-Id: I981185909f28bb20f96d56cb01cf5e1122f8d0a9

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