Removing a port from a VLAN filtering bridge is broken

[wkz]

Current Behavior

When operating on candidate, we should infer the removal of all VLAN memberships associated with a port being removed from the bridge.

But even if that is manually done, it is not possible to detach the port in a single transaction:

admin@infix-ad-00-00:/> configure
admin@infix-ad-00-00:/config/> no interface e2 bridge-port
admin@infix-ad-00-00:/config/> no interface br0 bridge vlans vlan 1 untagged e2
admin@infix-ad-00-00:/config/> leave
Error: EV ORIGIN: SHM event "done" ID 2 processing timed out.
Error: Can't commit to running-config

Whereas if we split it in two transactions, it works fine:

​admin@infix-ad-00-00:/> configure
admin@infix-ad-00-00:/config/> no interface br0 bridge vlans vlan 1 untagged e2
admin@infix-ad-00-00:/config/> leave
admin@infix-ad-00-00:/> configure
admin@infix-ad-00-00:/config/> no interface e2 bridge-port
admin@infix-ad-00-00:/config/> leave

This has to do with the fact that confd will incorrectly generate the VLAN deletions in the init action of the new config generation, rather than in the exit action of the previous one.

Expected Behavior

admin@infix-ad-00-00:/> configure
admin@infix-ad-00-00:/config/> no interface e2 bridge-port
admin@infix-ad-00-00:/config/> no interface br0 bridge vlans vlan 1 untagged e2
admin@infix-ad-00-00:/config/> leave

Should work

Steps To Reproduce

From the CLI:

1. Create a VLAN bridge, attach a port to it, add it to a VLAN
2. Remove the port

Additional information

No response