Remove local swift ring directory check
Remove local swift ring directory check

This fix will remove the local check for the swift ring directory.
Assuming the upgrade script is executed on the deployment host,
the swift ring files are not necessarily on this host, rather than
the first swift server.

Change-Id: Ie1f07a7884b669e2a0c44868711ce76070c8e4bf
Closes-Bug: #1546225

yanyao/openstack-deployment,yanyao/openstack-deployment,yanyao/openstack-deployment,yanyao/openstack-deployment