Don't stop volume service for failed re-export operations
Don't stop volume service for failed re-export operations

Commit b71570 "Set vol driver initialized before deleting volumes"
changed the manager behavior to call set_initialized() before
attempting to re-export volumes.

Drivers should not be considered initialized before re-export has
succeeded.  Otherwise a failure to export causes the volume
service to stop, when that failure should be handled like any other
failure to initialize.

Closes-Bug: 1257049
Related-Bug: 1232177
Change-Id: Ic6bc89ef3f15dbbc971fdd8c91117cccb5c2801b

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