[tempest] Test "test_multicast_between_vms_on_same_network" radonmly failing

[Rodolfo Alonso]

This test has been failing in the same job "neutron-tempest-plugin-openvswitch-iptables_hybrid" randomly in the last days:
* https://6b9cedea8669c4f84008-911d33bf37120f9bf3989feced914a34.ssl.cf5.rackcdn.com/885354/5/check/neutron-tempest-plugin-openvswitch-iptables_hybrid/88cca83/testr_results.html
* https://storage.bhs.cloud.ovh.net/v1/AUTH_dcaab5e32b234d56b626f72581e3644c/zuul_opendev_logs_ee8/882832/13/check/neutron-tempest-plugin-openvswitch-iptables_hybrid/ee8c405/testr_results.html
* https://1997b6358f32b9b17414-df15d2af993436e3199d990a33423a03.ssl.cf2.rackcdn.com/895155/1/gate/neutron-tempest-plugin-openvswitch-iptables_hybrid/1582390/testr_results.html

[yatin (yatinkarel)]

Seeing similar failure in other tests, like:-
- https://6b9cedea8669c4f84008-911d33bf37120f9bf3989feced914a34.ssl.cf5.rackcdn.com/885354/5/check/neutron-tempest-plugin-openvswitch-iptables_hybrid/88cca83/testr_results.html
- https://storage.gra.cloud.ovh.net/v1/AUTH_dcaab5e32b234d56b626f72581e3644c/zuul_opendev_logs_3e8/896397/1/check/neutron-tempest-plugin-linuxbridge-zed/3e8ddb9/testr_results.html
- https://b25b47e0f6f8fec19274-c50088756ed5d4a7ba789c333cf11d04.ssl.cf2.rackcdn.com/895975/1/check/neutron-tempest-plugin-ovn/65fabaa/testr_results.html

Looks generic issue with tests using advanced images.

[OpenStack Infra (hudson-openstack)]

Related fix proposed to branch: master
Review: https://review.opendev.org/c/openstack/neutron-tempest-plugin/+/897308

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/openstack/neutron-tempest-plugin/+/897308
Committed: https://opendev.org/openstack/neutron-tempest-plugin/commit/e4a1f5395344748fb21438c29b4816309b494e05
Submitter: "Zuul (22348)"
Branch: master

commit e4a1f5395344748fb21438c29b4816309b494e05
Author: yatinkarel <email address hidden>
Date: Wed Oct 4 15:01:50 2023 +0530

    Turn off host-passthrough in scenario jobs

    This was enabled with switch to cirros 0.6.2[1],
    but still seeing same tracebacks for cirros vm boot,
    this mode is not required for the jobs so let's
    turn it off. This may help in the other failures
    seen in the Related Bug.

    [1] https://review.opendev.org/c/openstack/neutron-tempest-plugin/+/890177
    Related-Bug: #2036603

    Change-Id: Ifb3972e74434b29a1c6acb9bc131678ba83d66a3

[yatin (yatinkarel)]

A recent failure https://storage.gra.cloud.ovh.net/v1/AUTH_dcaab5e32b234d56b626f72581e3644c/zuul_opendev_logs_ae3/926503/1/check/neutron-tempest-plugin-openvswitch-iptables_hybrid/ae336d1/testr_results.html