code: func ConfigFromBackend(coreBackend ...core.ConfigBackend) (msp.IdentityConfig, error) {
  
  	//create identity config
  	config := &IdentityConfig{backend: lookup.New(coreBackend...)}
  
  	//preload config identities
  	err := config.loadIdentityConfigEntities()
  	if err != nil {
  		return nil, errors.WithMessage(err, "failed to create identity config from backends")
  	}
  
  	return config, nil
  }
docs: //ConfigFromBackend returns identity config implementation of given backend