Ticket 48950 - Add systemd warning to the LD_PRELOAD example in /etc/sysconfig/dirsrv
Description: systemd warning about omitting the PORT was missing from the
LD_PRELOAD example.
Also fixed up file format/layout..
https://fedorahosted.org/389/ticket/48950
Reviewed by: nhosoi, amsharma, lkrispen (Thanks!!!)