Remove update_volume_status log message from NFS driver
Remove update_volume_status log message from NFS driver

The manager logs an INFO message when this action occurs already,
and it not called by anyone else, so don't log twice:

INFO [cinder.volume.manager] Updating volume status
DEBUG [cinder.volume.drivers.nfs] Updating volume status

Change-Id: Id99be0c0e50837c2b59963d983b9a7db3d25919a

NetApp/cinder,Thingee/cinder,tlakshman26/cinder-https-changes,Datera/cinder,ntt-sic/cinder,julianwang/cinder,github-borat/cinder,Thingee/cinder,apporc/cinder,leilihh/cinder,Accelerite/cinder,j-griffith/cinder,cloudbau/cinder,saeki-masaki/cinder,abusse/cinder,blueboxgroup/cinder,apporc/cinder,alex8866/cinder,bswartz/cinder,github-borat/cinder,cloudbase/cinder,Nexenta/cinder,spring-week-topos/cinder-week,maelnor/cinder,rickerc/cinder_audit,ntt-sic/cinder,ge0rgi/cinder,blueboxgroup/cinder,Akrog/cinder,redhat-openstack/cinder,takeshineshiro/cinder,scottdangelo/RemoveVolumeMangerLocks,rakeshmi/cinder,Paul-Ezell/cinder-1,CloudServer/cinder,tlakshman26/cinder-new-branch,tlakshman26/cinder-https-changes,mahak/cinder,openstack/cinder,NetApp/cinder,eharney/cinder,cloudbau/cinder,dims/cinder,petrutlucian94/cinder,CloudServer/cinder,cloudbase/cinder,petrutlucian94/cinder,NeCTAR-RC/cinder,potsmaster/cinder,nikesh-mahalka/cinder,JioCloud/cinder,JioCloud/cinder,Akrog/cinder,Hybrid-Cloud/cinder,phenoxim/cinder,openstack/cinder,potsmaster/cinder,redhat-openstack/cinder,nikesh-mahalka/cinder,phenoxim/cinder,NeCTAR-RC/cinder,abusse/cinder,winndows/cinder,julianwang/cinder,j-griffith/cinder,takeshineshiro/cinder,rickerc/cinder_audit,leilihh/cinder,inkerra/cinder,winndows/cinder,Datera/cinder,hguemar/cinder,rakeshmi/cinder,Thingee/cinder,eharney/cinder,manojhirway/ExistingImagesOnNFS,Paul-Ezell/cinder-1,bswartz/cinder,scality/cinder,nexusriot/cinder,scottdangelo/RemoveVolumeMangerLocks,tlakshman26/cinder-bug-fix-volume-conversion-full,nexusriot/cinder,Accelerite/cinder,duhzecca/cinder,Hybrid-Cloud/cinder,Nexenta/cinder,spring-week-topos/cinder-week,duhzecca/cinder,scality/cinder,alex8866/cinder,mahak/cinder,tlakshman26/cinder-bug-fix-volume-conversion-full,inkerra/cinder,hguemar/cinder,tlakshman26/cinder-new-branch,sasukeh/cinder,dims/cinder,manojhirway/ExistingImagesOnNFS,sasukeh/cinder,saeki-masaki/cinder,maelnor/cinder