'_hawkey.Reldep' object has no attribute 'name' in the version shipped
on RHEL-8. Add code to handle this situation in case it happens.
Default to using named attributes if these are available.
Signed-off-by: Tomáš Hozza <thozza@redhat.com>
Add implementation of standard-agnostic model for SBOM, and simple SPDX
v2.3 model. Also add convenience functions for converting DNF4 package
set to the standard-agnostic model and for converting it to SPDX model.
Cover the functionality with unit tests.
Signed-off-by: Tomáš Hozza <thozza@redhat.com>