Use nscd service files from glibc sources and make the service forking
    
    Currently the nscd service is installed in systemd as a simple
    service, which means that it is able to handle its own errors and does
    not quit.  Since nscd does not fit that description, i.e. it can exit
    on errors like, say, failing to parse nscd.conf, it should be declared
    as forking instead.