Currently it doesn't work in swift servers such as proxy-server,
object-server, account-server and container-server, in spite of
setting openstack_service_workers config in globals.yml.

Because it's not implement about workers in swift.

Closes-Bug: #1662751

Change-Id: Iae9a12952cd3fe285eed3d8fca2e667a68de15c7
Signed-off-by: jangseon ryu <jangseon.ryu@navercorp.com>