Remove obsolete Ansible group var files
- buildaarch74, buildarm, buildarm_stg
- copr_front, copr_front_dev, copr_front_stg
- dhcp
- faf_stg
- fas, fas_stg
- fedocal, fedocal_stg
- lockbox
- mirrorlist2, mirrorlist2_stg
- nuancier, nuancier_stg
- postgresql_server
- resultsdb_iad_prod
Signed-off-by: Nils Philippsen <nils@redhat.com>