Do not force live migration outside of Availability zone

If live migration tests are ran on environment with multiple AZ and
destination host for live migration is chosen from different AZ then
nova scheduler would stop such migration and live migration tests
would fail so in the case of CONF.compute.compute_volume_common_az
being set in config file, choose destination host from the same
availability zone (the same happens with cinder AZ).

Change-Id: I6bfad96ae3aa6cd8efd7ae2a0ce01c53140f617a
1 file changed