tests: use consistent bandwidth/downtime limits in migration tests
The different migration test cases are using a variety of settings
to ensure convergance/non-convergance. Introduce two helpers to
extra the common functionality and ensure consistency.
* Non-convergance: 1ms downtime, 30mbs bandwidth
* Convergance: 30s downtime, 1gbs bandwidth
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-Id: <
20220628105434.295905-5-berrange@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>