Drop any dimensioned streams from the keys and kdims.

def drop_streams(streams, kdims, keys):
    """
    Drop any dimensioned streams from the keys and kdims.
    """
    stream_params = stream_parameters(streams)
    inds, dims = zip(*[(ind, kdim) for ind, kdim in enumerate(kdims)
                       if kdim not in stream_params])
    get = operator.itemgetter(*inds) # itemgetter used for performance
    keys = (get(k) for k in keys)
    return dims, ([wrap_tuple(k) for k in keys] if len(inds) == 1 else list(keys))