Send swift upload instructions to workers

Have zuul send signed credentials as part of the job for workers to
consume and upload assets to a defined location.

Zuul currently doesn't care about logs however this change will
suggest a LOG_PATH to builders as a unqiue destination prefix
allowing zuul to know preemptively the destination.
The workers are still required to send a URL of the final location.

Change-Id: I042cdd2dd2407f381cafcabc5c6b83d9b9a9eb00
diff --git a/etc/zuul.conf-sample b/etc/zuul.conf-sample
index 75c84e4..ac8021b 100644
--- a/etc/zuul.conf-sample
+++ b/etc/zuul.conf-sample
@@ -23,6 +23,15 @@
 ;git_user_name=zuul
 zuul_url=http://zuul.example.com/p
 
+[swift]
+authurl=https://identity.api.example.org/v2.0/
+user=username
+key=password
+
+default_container=logs
+region_name=EXP
+logserver_prefix=http://logs.example.org/server.app/
+
 [smtp]
 server=localhost
 port=25