karbor: enable swift multi-workers
karbor: enable swift multi-workers

enable swift multi-workers for karbor fullstack parallel test
https://review.openstack.org/#/c/437841/

Change-Id: Ieba046fd189ae3c4cf1f61d4c2fba2aa1663f020

openstack-infra/project-config,openstack-infra/project-config