Add mising 'prometheus' yaml level

Rename prometheus ssl key

Change-Id: I5fb4093e1679a6e541061749ced800c29847a13b
diff --git a/prometheus/server/target/kubernetes.yml b/prometheus/server/target/kubernetes.yml
index d77ab3f..8abed5d 100644
--- a/prometheus/server/target/kubernetes.yml
+++ b/prometheus/server/target/kubernetes.yml
@@ -1,8 +1,9 @@
 parameters:
-  server:
-    target:
-      kubernetes:
-        api_ip: ${_param:kubernetes_control_address}
-        ssl_dir: /opt/prometheus/config
-        cert_name: kubelet-client.crt
-        key_name: kubelet-client.key
+  prometheus:
+    server:
+      target:
+        kubernetes:
+          api_ip: ${_param:kubernetes_control_address}
+          ssl_dir: /opt/prometheus/config
+          cert_name: prometheus-server.crt
+          key_name: prometheus-server.key