Generating image test case with all possible blueprint customizations is
supported only for `qcow2` image type. Generating `qcow2` images with
customizations was not a lot of fun. One had to use a special CLI option
for this case.
To streamline the generation of image test cases, drop the
`--with-customizations` option from the `generate-test-cases` script and
move the functionality to `format-request-map.json` by defining a new
`qcow2-customize` test case. This is very similar to what `*edge-rt`
test case already uses. This mean that when the test case for `qcow2`
image type is being generated, actually two test cases will be
generated. The filesystem customizations since RHEL-8.5 are handled
through distro-specific `overrides`.
Signed-off-by: Tomas Hozza <thozza@redhat.com>
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