Generate a Kickstart file that can be used with the Yum-based SPMA

The Yum-based SPMA obsoletes part of the old installation procedure.

This branch:

* Sets up the Yum repositories in a temporary location, 
* Installs the basic RPMs during the `%post` phase.
* Removes the zillion `rpm -i` statements.
* Keeps the execution of ncm-spma in the `post_reboot` scriptlet.

Overall, I feel installations are slighlty faster than they used to be.