code: func MatchNamespace(selectors []string, namespace string) (bool, string) {
  	for _, n := range selectors {
  		if n == namespace || n == Wildcard {
  			return true, "matched"
  		}
  	}
  	return false, fmt.Sprintf("no match, role selectors %v, server namespace: %v", selectors, namespace)
  }
docs: // MatchNamespace returns true if given list of namespace matches
  // target namespace, wildcard matches everything.