nova evacuate
performs an instance evacuation from down host to specified
host. The instance will be booted from a new disk,
but will preserve the configuration, e.g. id, name, uid, ip...etc.
New instance password can be passed to the command using the --password <pwd> option.
If not given it will be generated and printed after the command finishes successfully.
$nova evacuate evacuated_server_name host_b
The command returns a new server password.
+-----------+--------------+
| Property | Value |
+-----------+--------------+
| adminPass | kRAJpErnT4xZ |
+-----------+--------------+
