Let Grafana search in its own namespace for datasource config-maps

So far Grafana has only observed datasource-configmaps that were created in the namespace default. Now configmaps are used which are in the same namespace as Grafana.

Closes #50 (closed)

execution/infrastructure/grafana/values.yaml

@@ -47,8 +47,7 @@ sidecar:
     # If specified, the sidecar will search for datasource config-maps inside this namespace.
     # Otherwise the namespace in which the sidecar is running will be used.
     # It's also possible to specify ALL to search in all namespaces
-    searchNamespace: default
-
+    searchNamespace: null
 
 service:
   nodePort: 31199