Retry uploading messages to Swift up to 5 times

This should hopefully handle short, intermitent issues uploading to
Swift. We currently use the same retry policy when sending Zaqar
messages.

Related-Bug: #1789680
Change-Id: Ibee6ba188585f80f0f7d136c81146096cb4432c2

workbooks/messaging.yaml

@@ -113,6 +113,7 @@ workflows:
 
       persist_to_swift:
         action: swift.put_object
+        retry: count=5 delay=1
         input:
           container: <% $.container %>
           obj: <% "{0}/{1}.yaml".format($.type, now().format("%Y-%m-%d_%H:%M:%S")) %>
@@ -121,6 +122,7 @@ workflows:
 
       persist_to_swift_plan_latest:
         action: swift.put_object
+        retry: count=5 delay=1
         input:
           container: <% $.container %>
           obj: <% "deployment_status.yaml" %>