Use the rsyslog formula and state

https://github.com/Mirantis/mk-lab-salt-model/pull/205
diff --git a/rsyslog/client/single.yml b/rsyslog/client/single.yml
new file mode 100644
index 0000000..bf957d0
--- /dev/null
+++ b/rsyslog/client/single.yml
@@ -0,0 +1,2 @@
+classes:
+- service.rsyslog.client.single