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.
Add support for Debian 7.2 multiarch netboot CD

This enhances the Debian installer to detect and (hopefully) support the new
Debian 7.2 multiarch installer CD image available as the default download link
on the debian.org homepage.

The biggest change is that this includes both an i386 and an AMD64 kernel, and
package set, on a single disk.  Optimally, this actually means that we can
detect at runtime what CPU instruction set the client supports and boot the
correct image.

This makes, I believe, this the first multi-arch capable installer.  Which the
rest of the system won't yet support, but so it goes...

This fixes issue #82, where https://github.com/eglute discovered and reported
the failure.

Signed-off-by: Daniel Pittman <daniel@rimspace.net>