Besides the fact that shipping files in /etc is not recommended anymore, this
change will hopefully encourage users to customize the defaults via the mean
of drop-ins hence removing the risk of conflicts with downstream
customization.
In contrary, shipping empty directories *.conf.d/ in /etc is not a concern and
should suggest users to create drop-ins (bsc#1207056).
OBS-URL: https://build.opensuse.org/package/show/Base:System/systemd?expand=0&rev=1464
