Updated openstack/openstack
Project: openstack-dev/devstack  a20ab63842fbcb8dfc172f0aeadbfea7f107c9b1

Make Swift uses API_WORKERS

Keep the default to 1 instead of going wild, cause Swift really would
kill the VM if we let it go (and keeps the old behavior).

Change-Id: I7449c1bb485459169b8870c871b887cbab8be865