autoprovision: split script+unit into separate files

Now that we're using Jinja to render the kickstart scripts, we can
separate out scripts, systemd unit files, etc. into their own files and
`include` them.  This makes editing them much easier, especially since
syntax highlighting will work correctly.

fedora.ks.j2

@@ -16,4 +16,4 @@ qemu-guest-agent
 -fwupd
 %end
 
-{% include "autoprovision.ks" %}
+{% include "autoprovision.ks.j2" %}