Github user nvazquez commented on the issue:
https://github.com/apache/cloudstack/pull/1961
@borisstoyanov actually disk is not being dettached from vm before
migrating it, it is using vm's ROOT disk, it can be done on Vmware by setting
`livemigrate='true'` to migrate command. I'll work on refactoring the test so
that migration can be achieved
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