Need resource.prop resource list class

[Terry Howe]

SecurityGroup has a list of SecurityGroupRule. There is a kludge in the __init__ to convert the dicts into SecurityGroupRules. If there was a special resource list property with type=SecurityGroupRule that wouldn't need to be there.

[Brian Curtin (brian.curtin)]

Take a look at what's done in https://review.openstack.org/#/c/155995/6/openstack/compute/v2/limits.py to see if that'll work

We're going to have to do the type conversion somewhere, and I think it makes the most sense to unserialize as early as possible when that type is going to come into play, which would be an overridden get call. I think that approach also lines up with how https://review.openstack.org/#/c/157183/2/openstack/resource.py is proposed - we keep everything as-is until we need to serialize at the last second.

This is also how you'd do something like unicode/bytes conversion - as close as possible to the boundaries of your application.

I don't think we should have any special type to signify the list itself is special. It's Python so a list is a list and we should just document that it contains values we created of a certain type but not go any further. It really only matters on the receiving side of things that we're creating the right types for the list members.

[Terry Howe (thowe-g)]

Sounds good