'Lists all reserved instances/nodes which can be purchased from Amazon
for one or three year terms. Reservations are made at a region level
and reduce the hourly charge for instances.
More information can be found at http://goo.gl/ulXCC7.
:rtype: ``list`` of :class:`.EC2ReservedNode`'

def ex_list_reserved_nodes(self):

    params = {'Action': 'DescribeReservedInstances'}
    response = self.connection.request(self.path, params=params).object
    return self._to_reserved_nodes(response, 'reservedInstancesSet/item')
