When the firewall stage is provided with stage options, which set only
the default firewall zone, the `firewall-offline-cmd` command is
executed unconditionally without any parameters. This is because in this
case `ports`, `enabled_services` and `disabled_services` are all an
empty lists. This results in a failure with the following error message:
`Opening of '/etc/sysconfig/system-config-firewall' failed, exiting.`
Make sure that the second invocation of `firewall-offline-cmd` happens
conditionally, only when at least one of the `ports`, `enabled_services`
or `disabled_services` is a non-empty list.
Adjust the stage test to cover this scenario.
Signed-off-by: Tomas Hozza <thozza@redhat.com>
9054da7d25