package-afs-centos: use synchronize flags for delete
package-afs-centos: use synchronize flags for delete

It turns out if you read the documentation [1], it has an example for
synchronizing two directories with deletion and suggests using these
flags

[1] https://docs.ansible.com/ansible/latest/modules/synchronize_module.html#examples

Change-Id: Ib8aff5212d578668bf5073f28f08d12e7ddd3b1a

openstack-infra/openstack-zuul-jobs,openstack-infra/openstack-zuul-jobs