commit be052d619853b86637c49b6575b1886e1c2c7afd
author zhufl <zhu.fanglei@zte.com.cn> Mon Nov 04 10:56:02 2019 +0800
committer zhufl <zhu.fanglei@zte.com.cn> Thu Feb 20 10:53:42 2020 +0800
tree 25de12809aef09bc1ebb80e553caf77057259b93
parent 2844774bb2dff0273c587982015a3dbfe2adf7fb

Do not specify a host for live-migration for non homogeneous nodes

In production cloud with non homogeneous compute nodes, specifying
a host for live-migration may fail unexpectedly, e.g., if source host
is with CPU "E5-2699 v4" and the selected target host is with CPU
"E5-2670 v3", the live-migration will fail because of the downgrade
issue.

So this is to add config option can_migrate_between_any_hosts which
can be set to False so that in non homogeneous cloud it can select
destination host automatically.

Change-Id: I05e9c8360b86326b7f58b2c0600fcb420bc31482
Closes-Bug: #1851185