'Start node to running state.
:param node: the ``Node`` object to start
:type node: ``Node``
:return: starting operation result.
:rtype: ``bool``'

def ex_start_node(self, node):

    params = {'Action': 'StartInstance', 'InstanceId': node.id}
    resp = self.connection.request(self.path, params)
    return (resp.success() and self._wait_until_state([node], NodeState.RUNNING))
