'Request a list of networks and convert that list to a list of
OpenNebulaNetwork objects.
Request a list of networks from the OpenNebula web interface, and
issue a request to convert each XML object representation of a network
to an OpenNebulaNetwork object.
:rtype:  ``list`` of :class:`OpenNebulaNetwork`
:return: List of virtual networks.'

def _to_networks(self, object):

    networks = []
    for element in object.findall('NETWORK'):
        network_id = element.attrib['href'].partition('/network/')[2]
        network_element = self.connection.request(('/network/%s' % network_id)).object
        networks.append(self._to_network(network_element))
    return networks
