'Removes an IP address from the server
:param server_id: Id of the server
:rtype: ``str``
:param ip_id: ID of the IP address
:rtype: ``str``
:param keep_ip: Indicates whether IP address will be removed from
the Cloud Panel
:rtype: ``boolean``
:return: ``Node`` instance
:rtype: ``Node``'

def ex_remove_server_ip(self, server_id, ip_id, keep_ip=None):

    body = {}
    if (keep_ip is not None):
        body['keep_ip'] = keep_ip
    response = self.connection.request(action=('servers/%s/ips/%s' % (server_id, ip_id)), data=body, method='DELETE')
    return self._to_node(response.object)
