Disk size validation for flavors with root disk size of 0
The following discussion from !801 (merged) should be addressed:
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@cmart started a discussion: (+4 comments) There is a case that we won't see on Jetstream2, but it's haunting me from several years ago:
https://docs.openstack.org/nova/latest/user/flavors.html
The 0 size is a special case which uses the native base image size as the size of the ephemeral root volume.
This means that if a flavor has a root disk size of 0, we should always consider it big enough for the selected image (i.e. not show the warning).