Configure swift credentials for workers to push to

This change adds credentials as set up by fungi (2014-04-05T03:16:46)
http://eavesdrop.openstack.org/irclogs/%23openstack-infra/%23openstack-infra.2014-04-05.log

This allows zuul to send signed URL's for workers to push files to on
a per-job basis.

This change will require a zuul restart, not just a reload!

Change-Id: Ib198112db0493456345fec83b32fabf606d835d2
Merge "Configure swift credentials for workers to push to"