There was a logical mistake in Ignition that caused ignition.config.*
only to work when it was part of the ovfenv. Thus they were added but
the old CoreOS variables marked deprecated and kept. With both as OVF
variables each of them worked but directly specifying ignition.config.*
as guest variable still didn't because of the logical mistake.
Now there is a fix and both work well when specified directly as guest
variable (https://github.com/flatcar-linux/ignition/pull/11).
Delete the old CoreOS OVF variables because they just clutter the UI
and only the Ignition variables should be used in the UI.
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