Ticket #47298 - remove-ds-admin.pl does not stop the admin server
    
    Bug description: Keyword to be replaced for the build had a
    typo in the stopAdminServer subroutine.
    
    Fix description: Replacing "@with_systemdsystemunitdir@" with
    "@systemdsystemunitdir@".
    
    https://fedorahosted.org/389/ticket/47298
    
    Reviewed by Mark (Thank you!!)