Fix nova cert permissions

Make sure the following nova cerificates are created
with root:nova 640 mode.

 * mysql
 * rabbit
 * novncproxy

Change-Id: I2012a42a850d019e599abb7e49ce0944b1d23972
diff --git a/salt/minion/cert/rabbitmq/clients/openstack/nova.yml b/salt/minion/cert/rabbitmq/clients/openstack/nova.yml
index 04a6078..160acd9 100644
--- a/salt/minion/cert/rabbitmq/clients/openstack/nova.yml
+++ b/salt/minion/cert/rabbitmq/clients/openstack/nova.yml
@@ -22,6 +22,6 @@
           key_file: ${_param:rabbitmq_nova_client_ssl_key_file}
           cert_file: ${_param:rabbitmq_nova_client_ssl_cert_file}
           ca_file: ${_param:rabbitmq_nova_ssl_ca_file}
-          user: nova
+          user: root
           group: nova
           mode: 640