'Ironic hosts should not pass instance info.'

def _init_instance_info(self, computes_by_cell=None):

    context = context_module.RequestContext()
    self._load_cells(context)
    if (not computes_by_cell):
        computes_by_cell = {}
        for cell in self.cells:
            with context_module.target_cell(context, cell) as cctxt:
                computes_by_cell[cell] = objects.ComputeNodeList.get_all(cctxt).objects
    non_ironic_computes = {cell: [c for c in compute_nodes if (not self._is_ironic_compute(c))] for (cell, compute_nodes) in computes_by_cell.items()}
    super(IronicHostManager, self)._init_instance_info(non_ironic_computes)
