This is the first change to the ramdisk since v0.1.0. So, we now build
the image as initrd-X.Y.img, and link initrd.img to it. This lets us
have a few checks to make sure that people rebuild their ramdisks when
necessary.
in with xm-test in changeset 7634. It also adds an "autogen" script
that re-creates these files.
The auto-generated files really don't need to be in the tree, as they
should be generated by the user on the machine where they plan to run
xm-test.
Signed-off-by: Dan Smith <danms@us.ibm.com>