Ensure name is utf-8 when deleting rbd vol or snap
Ensure name is utf-8 when deleting rbd vol or snap

If the name supplied to librbd is not utf-8 e.g. unicode,
an exception is raised. This was previously fixed and
subsequently broken by commit cbe1d5f.

Change-Id: I29f5e9db87ceb5f9cfe3be43e76d3e860edaf6d7
Closes-Bug: bug 1292433

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