puppet broker: use 'puppetagent' as the service for Fedora RPM's from PL

In the latest Puppet Labs RPM's for Fedora, the puppet agent service is
called 'puppetagent.service'. Since Fedora now also uses systemd, use
systemd native commands to enavble/start the service
Red Hat installer: fix handling of rc.local

The installer erroneously manipulated the file /etc/rc.local which is just
a symlink to /etc/rc.d/rc.local; the file that is run when a system boots
is /etc/rc.d/rc.local

The attempt in os_complete.erb to remove the line running post_install.sh
then turned the symlink /etc/rc.local into a file; that file had the line
running post_install.sh removed from it, but /etc/rc.d/rc.local still had
it in it. The end result was that /etc/rc.local looked correct, but
/etc/rc.d/rc.local was running razor_postinstall on every single boot.