Default configurations are not applied to app host

[fw2568]

ConfigureAppConfiguration has currently no effect on ModulesHost.

This leads to problem when configuration should be available before module configuration, especially from ModulesHost.CreateDefaultBuilder.

  return ModulesHost.CreateDefaultBuilder(args)       //not applied to app host
      .ConfigureHostConfiguration(config => config    //applied to app host
      ).ConfigureAppConfiguration((ctx, config) =>     //not applied to app host
      {

      })