SPlit live media ks from installable media.

There are now differences in the *modified*
live media kickstart that don't need to be or
shouldn't be present in the installable media
kickstart, e.g. adding the eject package.

This patch generates two separate kickstarts
from the single kickstart, one for each ISO
target.
Shift location of live-iso target in makefile
Remove extraneous paren
Define KS relative to CURDIR.