* nixos/varnish: command line compatible with varnish 5.2.1, fixes https://github.com/NixOS/nixpkgs/issues/27409 * nixos/varnish: add support for modules (services.varnish.extraModules) * varnish-modules: init at 0.10.2 * varnish-geoip: init at 1.0.2 * varnish-rtstatus: init at 1.2.0 * varnish-digest: init at 1.0.1 * added services.varnish.extraCommandLine option