xen-org/xen-api — pull request #760 by jjd27 (2012-07-12 16:48:22+00:00)
Title: CA-75697: Disallow VBD.create during VM migration

Dev-tested as follows:
* Attempting "xe vbd-create" while the VM is doing a localhost pool_migrate, expecting an error.
* Attempting "xe vbd-create" while the VM is doing a localhost migrate_send, expecting an error.
* Attempting "xe vbd-create" while the VM is running but not undergoing any control-plane operations, expecting no error.