taas agent extension fails to start in VLAN only setup

[Lajos Katona]

If I would like to start tap-as-a-service with tunnel_types=[], taas agent extension throws this traceback:

Nov 08 15:06:55 taas neutron-openvswitch-agent[190886]: ERROR neutron File "/opt/stack/tap-as-a-service/neutron_taas/services/taas/agents/common/taas_agent.py", line 100, in initialize
Nov 08 15:06:55 taas neutron-openvswitch-agent[190886]: ERROR neutron self.taas_driver.initialize()
Nov 08 15:06:55 taas neutron-openvswitch-agent[190886]: ERROR neutron File "/opt/stack/tap-as-a-service/neutron_taas/services/taas/drivers/linux/ovs_taas.py", line 54, in initialize
Nov 08 15:06:55 taas neutron-openvswitch-agent[190886]: ERROR neutron self.setup_ovs_bridges()
Nov 08 15:06:55 taas neutron-openvswitch-agent[190886]: ERROR neutron File "/opt/stack/tap-as-a-service/neutron_taas/services/taas/drivers/linux/ovs_taas.py", line 79, in setup_ovs_bridges
Nov 08 15:06:55 taas neutron-openvswitch-agent[190886]: ERROR neutron self.tun_br.add_patch_port('patch-tun-tap', 'patch-tap-tun')
Nov 08 15:06:55 taas neutron-openvswitch-agent[190886]: ERROR neutron AttributeError: 'NoneType' object has no attribute 'add_patch_port'

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/c/openstack/tap-as-a-service/+/817449

[OpenStack Infra (hudson-openstack)]

Related fix proposed to branch: master
Review: https://review.opendev.org/c/openstack/tap-as-a-service/+/822302

[OpenStack Infra (hudson-openstack)]

Change abandoned by "Lajos Katona <email address hidden>" on branch: master
Review: https://review.opendev.org/c/openstack/tap-as-a-service/+/822302
Reason: Try another approach when a cfg option decides where to forward mirrored packets (https://review.opendev.org/c/openstack/tap-as-a-service/+/817449 )

[OpenStack Infra (hudson-openstack)]

Change abandoned by "Lajos Katona <email address hidden>" on branch: master
Review: https://review.opendev.org/c/openstack/tap-as-a-service/+/817449
Reason: Another approach is on its way see the GRE/ERSPAN mirroring (https://review.opendev.org/q/topic:bug%252F2015471 )