Previously, the support of UEFI has been captured only on the level or
architecture definition as a binary boolean value. In reality some of
the architectures are able to support legacy, UEFI or hybrid boot.
Introduce a new BootType value, defined on the architecture level, which
can be set to one of the three boot types mentioned above. The value set
on the architecture level can be overridden on the image type level in
the image type definition.
Add two unexported helper methods to the `imageType`, specifically
`getBootType()` which returns the boot type that should be used for the
image type and architecture combination. The values set explicitly in
the image type or architecture definition should not be used directly.
Second added method is `supportsUEFI()`, which returns boolean value
representing the fact if the image type supports UEFI boot.
Split and define the boot package sets separately for the legacy and
UEFI boot. The `PackageSets()` method of the imageType structure is
modified to take the boot type into consideration and append appropriate
package sets to the "os" package set.
Signed-off-by: Tomas Hozza <thozza@redhat.com>
49ed70a565