bridge: T4632: vlan aware bridge lacks CPU forwarding

[c-po]

The VLAN aware bridge was forwarding traffic between member ports, but traffic
destined torwards the CPU was dropped. This resulted in a gateway not reachable
or DHCP leases that could not be handed out.

(cherry picked from commit f60d0e1)

Change Summary

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Code style update (formatting, renaming)
• Refactoring (no functional changes)
• Migration from an old Vyatta component to vyos-1x, please link to related PR inside obsoleted component
• Other (please describe):

Related Task(s)

• https://phabricator.vyos.net/T4632

Component(s) name

bridge

Proposed changes

Add VLAN id to CPU (self)

How to test

Smoketests or:

VyOS

set interfaces bridge br0 enable-vlan
set interfaces bridge br0 member interface eth1 allowed-vlan '10'
set interfaces bridge br0 member interface eth1 allowed-vlan '20'
set interfaces bridge br0 member interface eth1 allowed-vlan '30'
set interfaces bridge br0 member interface eth1 allowed-vlan '40'
set interfaces bridge br0 member interface eth1 native-vlan '40'
set interfaces bridge br0 member interface eth2 allowed-vlan '30'
set interfaces bridge br0 member interface eth2 allowed-vlan '20'
set interfaces bridge br0 member interface eth2 allowed-vlan '10'
set interfaces bridge br0 member interface eth2 allowed-vlan '40'
set interfaces bridge br0 vif 10 address '10.0.10.1/24'
set interfaces bridge br0 vif 20 address '10.0.20.1/24'
set interfaces bridge br0 vif 30 address '10.0.30.1/24'
set interfaces bridge br0 vif 40 address '10.0.40.1/24'

Arista vEOS

vlan 10,20,30,40
interface Ethernet1
   switchport trunk allowed vlan 10,20,30,40
interface Vlan10
   ip address 10.0.10.2/24
interface Vlan20
   ip address 10.0.20.2/24
interface Vlan30
   ip address 10.0.30.2/24
interface Vlan40
   ip address 10.0.40.2/24
interface Ethernet1
   switchport trunk allowed vlan 10,20,30,40
   switchport mode trunk
   spanning-tree portfast

Cisco vIOS

interface GigabitEthernet0/0
 ip address 10.0.40.3 255.255.255.0
 duplex auto
 speed auto
 media-type rj45
!
interface GigabitEthernet0/0.10
 encapsulation dot1Q 10
 ip address 10.0.10.3 255.255.255.0
!
interface GigabitEthernet0/0.20
 encapsulation dot1Q 20
 ip address 10.0.20.3 255.255.255.0
!
interface GigabitEthernet0/0.30
 encapsulation dot1Q 30
 ip address 10.0.30.3 255.255.255.0
!

Checklist:

• I have read the CONTRIBUTING document
• I have linked this PR to one or more Phabricator Task(s)
• I have run the components SMOKETESTS if applicable
• My commit headlines contain a valid Task id
• My change requires a change to the documentation
• I have updated the documentation accordingly