consistent nova instance progress

Registered by yuntongjin

In listDetailServers API, the progress of instance is showing a percentage value of the build progress
http://developer.openstack.org/api-ref-compute-v2.1.html#listDetailServers

this is correct semantics for vmwaareapi and xenapi,
but in libvirt driver, this field is assigned as progress of live migration.

This BP will make the progress field as a percentage value of the build progress for libvirt driver.

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Drafter:
yuntongjin
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Assignee:
yuntongjin
Definition:
New
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