Removed firewall_stage1 from AutoYast in confirm-mode

- bnc#894130
- Firewall and sshd and vnc services are configured by firewall_stage1 in normal installation, but it can handle imported data from AutoYast profile
- For importing the data, there are another clients (`firewall` and `services-manager`), and they are called in second stage
- Data are exported well in normal installation, but again, they are exported to `firewall` and `services-manager` settings