Added enabled flag to mysql/rabbitMQ client certs

It is needed because we include cert templates on the system level.
Certs will be created only if x509 feature for mysql/rabbitMQ is enabled.

Change-Id: Icc57c9737f8e93910aded54202c796a9a880670e
diff --git a/salt/minion/cert/mysql/clients/openstack/heat.yml b/salt/minion/cert/mysql/clients/openstack/heat.yml
index 1246dae..f338de7 100644
--- a/salt/minion/cert/mysql/clients/openstack/heat.yml
+++ b/salt/minion/cert/mysql/clients/openstack/heat.yml
@@ -9,6 +9,7 @@
     minion:
       cert:
         mysql-heat-client:
+          enabled: ${_param:openstack_mysql_x509_enabled}
           host: ${_param:salt_minion_ca_host}
           authority: ${_param:salt_minion_ca_authority}
           common_name: mysql-heat-client