Separate the errors for no ks specified and file not found #175
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It's more helpful to the user if we don't combine "you didn't give me a
kickstart file" and "you gave me a kickstart file, but it doesn't
exist".
In addition to giving separate error messages for the two cases, the
"you gave me a kickstart file, but it doesn't exist" says what kickstart
file it thinks it's looking for, which will help users catch syntax
errors.
Fixes #174