Remove unused return values and commented out code from NFS driver
Remove unused return values and commented out code from NFS driver

bug 1037622

Change-Id: Idea3005ad94fd6bfc76fd0f3969ee78e3031767e

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