'Returns a list of HostStates that represents all the hosts
the HostManager knows about. Also, each of the consumable resources
in HostState are pre-populated and adjusted based on data in the db.'

def get_all_host_states(self, context):

    self._load_cells(context)
    (compute_nodes, services) = self._get_computes_for_cells(context, self.cells)
    return self._get_host_states(context, compute_nodes, services)
