TOS 5 -> 6 update might break guest network

switch-branch from HBS 5.x with guest Wi-Fi set up to HBK 6.0 might omit guest_turris fw zone rename to tr_guest leading to unapplicable guest_turris zone related firewall rules.

The rename should be arranged automatically by firewall-zone-limit script (related to turris/foris-controller/foris-controller!97 (merged)).

Happened on Omnia with several custom bridges and related zones FW rules set up through luci. Was possible to fix by running firewall-zone-limit script manually.

I wasn't able to reproduce this on another Omnia with HBK and just basic configuration (the guest_turris zone was renamed properly to tr_guest during the update).

How to reproduce

• setup guest WiFi through reforis in TOS 5
• check the guest firewall zone is named guest_turris
• upgrade (switch-branch) to TOS 6
• (optionally apply not yet merged network migration script from packages!956 (merged))
• unless guest_turris zone has been renamed to tr_guest the guest network now cannot access internet but can access the router web interface (should behave the other way around) and firewall outputs Warning: Section 'guest_turris' must not have a name longer than 11 characters on manual restart (/etc/init.d/firewall restart)

@jhoracek @mmatejek @jschlehofer