Add scenario tests for live migration in tempest

[Nithya Ganesan]

This bug aims at adding scenario tests for live migration in tempest. The following scenarios are considered to begin with,

1. Verify network connectivity to the VM during live migration
2. Verify migration of VMs with cinder volumes attached to it
3. Verify migration of VM with data on root and ephemeral disk

[Nithya Ganesan (nithya-ganesan)]

Discussed about the bug in the openstack QA meeting today. Sean Daque clarified that we dont have multi node deployment yet, it would not be possible to validate the tests we develop. We may have to hold the development of these tests until we get a better validation environment for live migration

[Matthew Treinish (treinish)]

So this kind of test will definitely be welcomed into tempest, but without having a gating verification mechanism we won't merge it, otherwise it would bitrot very quickly. So I'm marking this as triaged with a wishlist prio.

[Andrea Frittoli (andrea-frittoli)]

We do have a multimode gate available now.

[chandan kumar (chkumar246)]

@Nithya, There is no update on this bug, Please unassign it if you are not working on this bug. Someone else can pick it.

[Martin Kopec (mkopec)]

I would say this has been done already, f.e. see:

https://opendev.org/openstack/tempest/commit/c7b0bc9f698b44cad4687e9a0ada6858b7a90f2f
https://opendev.org/openstack/tempest/src/branch/master/tempest/scenario/test_volume_migrate_attached.py