[CF-23] Add verify step into migrate_vms.yaml
[CF-23] Add verify step into migrate_vms.yaml

CF doesn't remove broken VMs from destination
because migrate_vms scenarion didn't contain verify step.
Add remove_failed_instances step into verify section.

SVilgelm/CloudFerry,SVilgelm/CloudFerry,MirantisWorkloadMobility/CloudFerry,mgrygoriev/CloudFerry,SVilgelm/CloudFerry,MirantisWorkloadMobility/CloudFerry,SVilgelm/CloudFerry,mgrygoriev/CloudFerry,MirantisWorkloadMobility/CloudFerry,mgrygoriev/CloudFerry,mgrygoriev/CloudFerry,MirantisWorkloadMobility/CloudFerry