Comment 5 for bug 1741810

I have the same issue on Pike release.

Analysis:
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Nova gets image property like 'testimg.os=linux' from glance, but it's dropped when nova creates req_spec here:
https://github.com/openstack/nova/blob/stable/pike/nova/compute/api.py#L899

It seems from_dict in ImageMetaProps class only keeps properties which have key name predefined in source code: (_legacy_property_map and self.fields)
https://github.com/openstack/nova/blob/stable/pike/nova/objects/image_meta.py#L552
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My configuration is same as ByungYeol Woo. It works fine on Kilo. I'm not sure if any other configuration is missed.