Use segment size of 5GB for swift (fixes camptocamp#2)

Author: mcanevet

9.5/templates/pghoard.json.tmpl

@@ -34,6 +34,7 @@
             "user":"{{getenv "OS_USERNAME"}}",
             "key":"{{getenv "OS_PASSWORD"}}",
             "auth_url":"{{getenv "OS_AUTH_URL"}}",
+            "segment_size":"5368709120",
             "container_name":"{{getenv "OS_CONTAINER_NAME"}}",
             {{if getenv "OS_REGION_NAME"}}
             "region_name":"{{getenv "OS_REGION_NAME"}}",