interface: T6592: remove interface from conntrack ct_iface_map on deletion (backport #3857)

[mergify]

Change Summary

We always have had stale interface entries in the ct_iface_map of nftables/ conntrack for any interface that once belonged to a VRF.

This commit will always clean the nftables interface map when the interface is deleted from the system.

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://vyos.dev/T6592

Related PR(s)

• interfaces: T6592: moving an interface between VRF instances failed #3834

Component(s) name

vyos.interfaces

Proposed changes

How to test

Smoketest result

[email protected]:~$ /usr/libexec/vyos/tests/smoke/cli/test_interfaces_l2tpv3.py
test_add_multiple_ip_addresses (__main__.L2TPv3InterfaceTest.test_add_multiple_ip_addresses) ... ok
test_add_single_ip_address (__main__.L2TPv3InterfaceTest.test_add_single_ip_address) ... ok
test_add_to_invalid_vrf (__main__.L2TPv3InterfaceTest.test_add_to_invalid_vrf) ... ok
test_dhcp_client_options (__main__.L2TPv3InterfaceTest.test_dhcp_client_options) ... skipped 'not supported'
test_dhcp_disable_interface (__main__.L2TPv3InterfaceTest.test_dhcp_disable_interface) ... skipped 'not supported'
test_dhcp_vrf (__main__.L2TPv3InterfaceTest.test_dhcp_vrf) ... skipped 'not supported'
test_dhcpv6_client_options (__main__.L2TPv3InterfaceTest.test_dhcpv6_client_options) ... skipped 'not supported'
test_dhcpv6_vrf (__main__.L2TPv3InterfaceTest.test_dhcpv6_vrf) ... skipped 'not supported'
test_dhcpv6pd_auto_sla_id (__main__.L2TPv3InterfaceTest.test_dhcpv6pd_auto_sla_id) ... skipped 'not supported'
test_dhcpv6pd_manual_sla_id (__main__.L2TPv3InterfaceTest.test_dhcpv6pd_manual_sla_id) ... skipped 'not supported'
test_interface_description (__main__.L2TPv3InterfaceTest.test_interface_description) ... ok
test_interface_disable (__main__.L2TPv3InterfaceTest.test_interface_disable) ... ok
test_interface_ip_options (__main__.L2TPv3InterfaceTest.test_interface_ip_options) ... ok
test_interface_ipv6_options (__main__.L2TPv3InterfaceTest.test_interface_ipv6_options) ... ok
test_interface_mtu (__main__.L2TPv3InterfaceTest.test_interface_mtu) ... ok
test_ipv6_link_local_address (__main__.L2TPv3InterfaceTest.test_ipv6_link_local_address) ... ok
test_move_interface_between_vrf_instances (__main__.L2TPv3InterfaceTest.test_move_interface_between_vrf_instances) ... ok
test_mtu_1200_no_ipv6_interface (__main__.L2TPv3InterfaceTest.test_mtu_1200_no_ipv6_interface) ... ok
test_span_mirror (__main__.L2TPv3InterfaceTest.test_span_mirror) ... skipped 'not supported'
test_vif_8021q_interfaces (__main__.L2TPv3InterfaceTest.test_vif_8021q_interfaces) ... skipped 'not supported'
test_vif_8021q_lower_up_down (__main__.L2TPv3InterfaceTest.test_vif_8021q_lower_up_down) ... skipped 'not supported'
test_vif_8021q_mtu_limits (__main__.L2TPv3InterfaceTest.test_vif_8021q_mtu_limits) ... skipped 'not supported'
test_vif_8021q_qos_change (__main__.L2TPv3InterfaceTest.test_vif_8021q_qos_change) ... skipped 'not supported'
test_vif_s_8021ad_vlan_interfaces (__main__.L2TPv3InterfaceTest.test_vif_s_8021ad_vlan_interfaces) ... skipped 'not supported'
test_vif_s_protocol_change (__main__.L2TPv3InterfaceTest.test_vif_s_protocol_change) ... skipped 'not supported'

----------------------------------------------------------------------
Ran 25 tests in 42.808s

OK (skipped=14)

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

---

This is an automatic backport of pull request #3857 done by [Mergify](https://mergify.com).

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