Timeout instance creation when spawning

Registered by Taihsiang Ho on 2020-07-13

nova instances remain in BUILD/spawning state if qemu-img convert does not execute to completion. This feature is a fallback when qemu used by nova malfunctions. Please see these real world examples[1].

[1]

ubuntu bionic/train https://bugs.launchpad.net/openstack-bundles/+bug/1880828
Red Hat OpenStack Platform https://access.redhat.com/solutions/3315611

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Drafter:
Taihsiang Ho
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