[ofw] [PATCH] Make WSD use new IBAT library

[Sean Hefty]

>Making IBAT::Resolve synchronous would move the loop/sleep into it, which
>removes the option for the caller to process it asynchronously (or do something
>else in between calls).

I don't mind ibat:resolve being asynchronous, just the fact that it requires
polling to check for completions.  Why not add an overlapped parameter?

>The pending case doesn't happen often, except in very busy fabrics because
>IPoIB does a PR query to send the unicast response to an ARP request.

Is the pending related to the query or the ARP?  Why would the activity on the
subnet change whether the call returns pending?

- Sean