Mark "test_live_migration_with_trunk" as unstable

This issue is related to:
* https://bugs.launchpad.net/neutron/+bug/2033887: the patches
  previously merged in the Neutron repository [1][2] should be
  reverted.
* https://bugs.launchpad.net/neutron/+bug/2024160: this issue
  is still present.

[1]https://review.opendev.org/c/openstack/neutron/+/882581
[2]https://review.opendev.org/c/openstack/neutron/+/888776

Related-Bug: #2024160
Related-Bug: #2033887
Change-Id: Ic58fef4fa83a43eee97d1e5a09e259f604a8971a
1 file changed