Bug 755754 - Unable to start dirsrv service using systemd
    
    https://bugzilla.redhat.com/show_bug.cgi?id=755754
    Resolves: bug 755754
    Bug Description: Unable to start dirsrv service using systemd
    Reviewed by: nhosoi (Thanks!)
    Branch: master
    Fix Description: Instead of blindly creating symlinks for dirsrv service
    instances, check to see if there is already a service with that name.
    Platforms tested: Fedora 16
    Flag Day: no
    Doc impact: no