code: public List<ExtPluginConfiguration> listPluginConfigurations(final String keyprefix, final String serviceName)
      {
          return listPluginConfigurations(keyprefix, serviceName, true);
      }
docs: Return a list of resource model configuration
  
  @param serviceName
  @param keyprefix prefix for properties
  @return List of Maps, each map containing "type": String, "props":Properties