Add service class for gnocchi client

New class for gnocchi client is being added on service
level which can be overriden on system or cluster levels

Change-Id: I935233f9fb4fac325e10b5adc7fbf41d9bdfb8b2
Related-PROD: PROD-20551
diff --git a/metadata/service/client/init.yml b/metadata/service/client/init.yml
new file mode 100644
index 0000000..028c0f2
--- /dev/null
+++ b/metadata/service/client/init.yml
@@ -0,0 +1,6 @@
+applications:
+  - gnocchi
+parameters:
+  gnocchi:
+    client:
+      enabled: true