Add support for Nebula and Tetralith

[gold2718]

These (Swedish) machines are supported in the NorESM2 release version.
This support should be brought into ccs_config_noresm.

[mvdebolskiy]

Is this still relevant?

[mvertens]

Yes - I think it is. These are swedish machines. @gold2718 - can you please comment on this.

[gold2718]

Yes (note that Nebula is supposed to be for MET use even though it is sited in Sweden).