Pre install_specs() group & package exclude workflow in Anaconda

gistfile1.txt

Pre install_specs() group & package exclude workflow in Anaconda
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1) get a list of excluded groups from kickstart
2) when selecting an environment:
2.1) resolve it to a list of groups
2.2) remove excluded groups from the lists
2.3) tell dnf to add the remaining groups to the transaction
3) get a list of groups that should be installed from kickstart and/or UI
3.1) remove any groups that are in the list of excluded groups
4) get a list of excluded packages
4.1) tell DNF to exclude the packages
(self._base.sack.add_excludes(pkgs))
5) get a list of packages to install from kickstart, requirements (virt, realm join, etc.) & kernel
5.1) tell DNF to install those packages
6) start the transaction

NOTES:
- looks like pre-install_specs() DNF could exclude packages but nothing else
- we first tell DNF to exclude paclkages and then what to install and DNF
  supposedly skips any packages we marked as excluded