Do not default XEN guest images to "packages". Lets make the default
a single slice image, since we can now pull the kernel (ramdisk) out from the guest filesystem (using pygrub for linux, or just mounting BSD filesystems). This is a lot faster and easier to deal with. I added an option to the newimage page so that people can set this, but in general we need a better way to guess that we need it. Always set for EC2 images.
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