Ironic system upgrade metadata

The patch adds system-level metadata for Ironic
upgrades

Change-Id: I3003232d302a52c003e262dcf78db115982ba6b5
Related-PROD: PROD-27332
diff --git a/ironic/api/single.yml b/ironic/api/single.yml
index 5eb290b..3264453 100644
--- a/ironic/api/single.yml
+++ b/ironic/api/single.yml
@@ -2,6 +2,7 @@
 - system.salt.minion.cert.mysql.clients.openstack.ironic
 - system.salt.minion.cert.rabbitmq.clients.openstack.ironic
 - service.ironic.api.single
+- system.ironic.upgrade
 parameters:
   linux:
     system: