Features:
+* possibly apply systemd-sysctl per network device subtrees on hotplug
+
+* add conditions for file executability
+
+* allow creating fifos with tmpfiles
+
* implement Register= switch in .socket units to enable registration
in Avahi, RPC and other socket registration services.
- enabling dbus services
- status update
- /etc/sysconfig and /etc/default
+ - how to make changes to sysctl and sysfs attributes
* allow port=0 in .socket units