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!

Note this is unreverts the revert in
c1b98eaff618b8c739cc02f089ef6fe6c02cbcc3 but is slightly edited hence
the lack of a proper revert commit. The reason for the revert has been
debugged and was due to rax identity service not providing a catalog
entry for swift when a tenant name is provided.

Change-Id: I04d3207002f7422b9851515ee88a74b19dd2f248

manifests/init.pp

@@ -34,6 +34,13 @@ class zuul (
   $statsd_host = '',
   $git_email = '',
   $git_name = '',
+  $swift_authurl = '',
+  $swift_user = '',
+  $swift_key = '',
+  $swift_tenant_name = '',
+  $swift_region_name = '',
+  $swift_default_container = '',
+  $swift_default_logserver_prefix = '',
 ) {
   include apache
   include pip

templates/zuul.conf.erb

@@ -30,3 +30,21 @@ git_user_email=<%= git_email %>
 <% if git_name != "" -%>
 git_user_name=<%= git_name %>
 <% end -%>
+
+<% if swift_authurl != "" -%>
+[swift]
+authurl=<%= swift_authurl %>
+user=<%= swift_user %>
+key=<%= swift_key %>
+<% if swift_tenant_name != "" -%>
+tenant_name=<%= swift_tenant_name %>
+<% else -%>
+# tenant_name is not provided here as some swift providers
+# do not have identity servers that work when tenant_name
+# is provided. You may set the tenant_name if necessary
+# but otherwise it is unset to accomodate these providers.
+<% end -%>
+region_name=<%= swift_region_name %>
+default_container=<%= swift_default_container %>
+default_logserver_prefix=<%= swift_default_logserver_prefix %>
+<% end -%>