Gutyán Gábor / circlestack

note: this doesn't work

_operation methods now only need to accept those generated arguments that are
actually used.

dashboard, vm: implement remove_disk on InstanceTemplate and use it instead of dispatching on appliance type

Patching __new__ on an object seems to have lasting effects even after the
context block's end.

SaveAsTemplateOperation optimistic shutdown.

Saving disks synchronously.