'return a list of available sizes
Currently, the size of the node is dictated by the chosen OS base
image, they cannot be set explicitly.
@inherits: :class:`NodeDriver.list_sizes`'

def list_sizes(self, location=None):

    return [NodeSize(id=1, name='default', ram=0, disk=0, bandwidth=0, price=0, driver=self.connection.driver)]
