Correction in log massage format syntax
Correction in log massage format syntax

Dictionary key used wrongly as '%(key)' instead of '%(key)s'
while formatting log message.

Change-Id: I2e31bfdac1021ee00bb001283c4f4ea9c273bc4c
Closes-bug: #1619584

eharney/cinder,phenoxim/cinder,mahak/cinder,Datera/cinder,openstack/cinder,Datera/cinder,j-griffith/cinder,cloudbase/cinder,NetApp/cinder,mahak/cinder,openstack/cinder,NetApp/cinder,j-griffith/cinder,cloudbase/cinder,Hybrid-Cloud/cinder,phenoxim/cinder,Hybrid-Cloud/cinder,eharney/cinder,Nexenta/cinder,ge0rgi/cinder,Nexenta/cinder