Basic host identity manager #3840
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Вводим новую сущность HostIdentity, она содержит IP адреса и проверенные имена хоста, если они есть. Идея в том, что мы один раз для каждого хоста вычисляем эти адреса, каждый из них должен быть виден с других хостов (поэтому каждое имя мы проверяем в dns). То есть мы скипаем всякие локальные, link-local адреса, а еще выбрасываем алиасы, прописанные где-либо кроме dns (то есть например всякие настройки systemd, которые у нас всплывали на debian, перестают давать нам неправильные имена)
Чтобы не перегружать HostIdentity, настройки резолвинга вынесены в отдельный класс полиси. Там же упорядочивание адресов (как нам упорядочивать адреса, чтобы понять какой адрес первичный и самый главный?)