This method is in the AMQP 0.9.1 spec and it is supported by RabbitMQ.
This is useful when the secret used in the connection has an expiry, as
it allows the applications to renew the secret without the hassle of
closing-reconnecting consumers/producers.

Signed-off-by: Aitor Perez Cedres <acedres@vmware.com>

Setting up an OAuth2 server to end-2-end test this function feels a bit
overkill. This function is used mainly in the context of OAuth2
authentication, where tokens expire. From this client perspective, all
it has to ensure is that a specific frame is put out in the wire to
RabbitMQ server. Then we trust that RabbitMQ will hold its part of the
contract and do the right thing.

Signed-off-by: Aitor Perez Cedres <acedres@vmware.com>