Truncate images if preallocation is true

Registered by Silvan Kaiser

If preallocation is configured to true truncating images can provide improved performance without additional drawbacks.
This also does not solve but mitigate incomplete allocation as discussed in bug #1510328[1]

[1](https://bugs.launchpad.net/nova/+bug/1510328)

Blueprint information

Status:
Not started
Approver:
None
Priority:
Undefined
Drafter:
Silvan Kaiser
Direction:
Needs approval
Assignee:
Silvan Kaiser
Definition:
New
Series goal:
None
Implementation:
Unknown
Milestone target:
None

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Gerrit topic: https://review.openstack.org/#q,topic:bp/truncate-images,n,z

Addressed by: https://review.openstack.org/480464
    [WIP] Add truncate for images if prealloc is true

Gerrit topic: https://review.openstack.org/#q,topic:bug/1510328,n,z

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