Remove unused task from manager create_volume flow
Remove unused task from manager create_volume flow

ExtractSchedulerSpecTask hasn't been ever used in the
create_volume flow, so it should be deleted.

Change-Id: Ia841e224bc253c68ed21520951016a1a90634faf

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