Steps:

1. Disable the setting display_fqdn_for_hosts in Satellite
2. Navigate to Hosts > Host Collections > Create/Select any Host Collections
3. Move to Host tab -> Add or List/Remove
4. Verify short-names are used and domain isn't appended

DEV Tracker for https://issues.redhat.com/browse/SAT-21374
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2265506