Do not advertise .d snippets over main config file For daemons which have a main configuration file, there's little reason for the administrator to use configuration snippets. They are useful for packagers which need to override settings, but we shouldn't advertise that as the main way of configuring those services. https://bugs.freedesktop.org/show_bug.cgi?id=89397

timesyncd: Support timesyncd.conf.d directories in the usual search paths

timesyncd: beef up NTP server selection logic, and acquire NTP servers from DHCP

timesyncd: read server settings from a configuration file Also, allow compiling in a default server list via a configure command line item.