Add system reclass for gnocchi

Change-Id: I3f6a4fb5c48b27d6ae8259c0d9360ee1ef7a83f5
Related-Prod: https://mirantis.jira.com/browse/PROD-17727
diff --git a/gnocchi/server/single.yml b/gnocchi/server/single.yml
new file mode 100644
index 0000000..035491e
--- /dev/null
+++ b/gnocchi/server/single.yml
@@ -0,0 +1,2 @@
+classes:
+- service.gnocchi.server.single