Use a common topology for multiple partitions

[teojgo]

I am currently doing some experiments where I generate many system partitions on the fly, based on a common topology. E.g system:gpu1, system:gpu2, system:gpu3 which are more or less copies of the system:gpu with only a change in name and maybe some access parameter. The behaviour or ReFrame at the moment is try to autodetect (unless disabled) the partition topology. But it's the same for all the systems so it would be good if it could be retrieved once or use the system:gpu one.