The same information can be inferred from definitions in variants.xml:
if the variant has no groups defined, we include packages from all
groups. By the same logic we can also include all groups in the comps
file.
The config validation is updated to give a hint on how to remove the
option from the configuration.
Relates: #29
Signed-off-by: Lubomír Sedlář <lsedlar@redhat.com>
a042906717