Since resolve() switched to a callback mechanism all uw_resolver objects

    pass through resolve() and either asr_resolve_done() or
    ub_resolve_done().
    With that we can pull resolver_ref() and resolver_unref() into those
    functions to make the reference counting easier.
    Only check_resolver is special since it needs to refcount the to be
    checked resolver. But the resolver doing the actual work is
    automatically refcounted by resolve() and *_resolve_done().
    One last piece of the puzzle is to track the uw_resolver object in
    cb_data so that the *_resolve_done() functions have access to it.
    This also allowes us to remove the ad-hoc passing of the resolver in
    query_imsg. Since the callback functions all need access to the
    resolver that did the work we pass it in as first argument.

    OK otto

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