Async

The operation deferral has now been hand-tested.
Quoting henn (2014-10-17 17:29:21)
>    Could we switch this loop to handling one action at a time?
> 
>    Right now, if there is an error handling one port, the functionality of
>    every other port will be affected.

Yeah, that occurred to me. The downside to doing them one at a time is,
you end up logging in and out of the switch for each one. Avoiding this
would involve reorganizing how the drivers are layed out.