Generate random keystone users

Change-Id: I8dbd07b10d29b43d1c35fa76bcaa0f0efb32beda
Related-Prod: PROD-29868
diff --git a/nova/control/cluster.yml b/nova/control/cluster.yml
index 2527b33..e7f76fa 100644
--- a/nova/control/cluster.yml
+++ b/nova/control/cluster.yml
@@ -44,7 +44,7 @@
         host: ${_param:openstack_database_address}
         port: 3306
         name: nova
-        user: nova
+        user: ${_param:mysql_nova_username}
         password: ${_param:mysql_nova_password}
         x509:
           enabled: ${_param:openstack_mysql_x509_enabled}
@@ -58,7 +58,7 @@
         region: ${_param:openstack_region}
         host: ${_param:cluster_vip_address}
         port: 35357
-        user: nova
+        user: ${_param:keystone_nova_username}
         password: ${_param:keystone_nova_password}
         tenant: service
         protocol: ${_param:cluster_internal_protocol}
@@ -96,7 +96,7 @@
         engine: neutron
         region: ${_param:openstack_region}
         host: ${_param:neutron_service_host}
-        user: neutron
+        user: ${_param:keystone_neutron_username}
         password: ${_param:keystone_neutron_password}
         port: 9696
         mtu: 1500