Fix logging guideline violations in volume/api.py
Fix logging guideline violations in volume/api.py

There were a few cases where logging was not following
the logging guidelines for i18m, delayed string
interpolation, and non-duplicating strings at different
levels. This patch cleans up those instances.

Change-Id: Ic42f3e9d084cbb7262ad6e479d9608fbf56a63ee

phenoxim/cinder,winndows/cinder,Hybrid-Cloud/cinder,scality/cinder,tlakshman26/cinder-bug-fix-volume-conversion-full,scottdangelo/RemoveVolumeMangerLocks,dims/cinder,eharney/cinder,tlakshman26/cinder-new-branch,takeshineshiro/cinder,rakeshmi/cinder,nexusriot/cinder,nikesh-mahalka/cinder,saeki-masaki/cinder,cloudbase/cinder,Paul-Ezell/cinder-1,tlakshman26/cinder-https-changes,Nexenta/cinder,openstack/cinder,leilihh/cinder,potsmaster/cinder,rakeshmi/cinder,tlakshman26/cinder-bug-fix-volume-conversion-full,Hybrid-Cloud/cinder,Datera/cinder,bswartz/cinder,Akrog/cinder,sasukeh/cinder,manojhirway/ExistingImagesOnNFS,leilihh/cinder,cloudbase/cinder,phenoxim/cinder,apporc/cinder,duhzecca/cinder,scality/cinder,julianwang/cinder,JioCloud/cinder,CloudServer/cinder,saeki-masaki/cinder,JioCloud/cinder,Akrog/cinder,NetApp/cinder,openstack/cinder,scottdangelo/RemoveVolumeMangerLocks,j-griffith/cinder,dims/cinder,bswartz/cinder,tlakshman26/cinder-new-branch,takeshineshiro/cinder,nexusriot/cinder,sasukeh/cinder,Paul-Ezell/cinder-1,ge0rgi/cinder,apporc/cinder,Datera/cinder,mahak/cinder,CloudServer/cinder,winndows/cinder,eharney/cinder,NetApp/cinder,j-griffith/cinder,manojhirway/ExistingImagesOnNFS,petrutlucian94/cinder,Nexenta/cinder,petrutlucian94/cinder,duhzecca/cinder,julianwang/cinder,potsmaster/cinder,mahak/cinder,tlakshman26/cinder-https-changes,nikesh-mahalka/cinder