Merge pull request #278555 from leona-ya/kresd-port-only-regex

  mkListen = kind: addr: let

    al_v4 = builtins.match "([0-9.]+):([0-9]+)($)" addr;

    al_v6 = builtins.match "\\[(.+)]:([0-9]+)(%.*|$)" addr;

    al_portOnly = builtins.match "([0-9]+)" addr;

    al_portOnly = builtins.match "(^)([0-9]+)" addr;

    al = findFirst (a: a != null)

      (throw "services.kresd.*: incorrect address specification '${addr}'")

      [ al_v4 al_v6 al_portOnly ];