Fixes Opt type of use_multipath_for_image_xfer
Fixes Opt type of use_multipath_for_image_xfer

Changed use_multipath_for_image_xfer from StrOpt to BoolOpt

Change-Id: Id02ba23b233d348885250ccb8c14fcf04667adec

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