This patch to usysconf adds a systemd-sockets trigger, which listens for
additions/changes to vendor-enabled .socket units installed to
/usr/lib/systemd/system/sockets.target.wants/ and subsequently fires off
a systemctl restart sockets.target.
This has the effect of activating newly installed .socket units
immediately after installation. It also restarts any manually
deactivated vendor-enabled .socket units.
Prior to the addition of this trigger, newly installed vendor-enabled
.socket units would only be activated after a reboot.