Perform stack upgrade actions in a parallel fashion

Hey guys.

Would be nice to see Rancher do stack upgrades in a fully parallel fashion. At the moment the upgrades happen one container at a time, and it’s rather slow if I have 32 containers. I have 16 hosts in my farm.

Would be nice to see upgrades take place in a more parallel fashion, or at least with one thread per host.

Cheers

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