It is recommended that all users of the Pika driver transition to
using the Rabbit driver instead. Typically this is done by changing
the prefix of the transport_url configuration option from "pika://..."
to "rabbit://...". There are no changes required to the RabbitMQ
server configuration.
Change-Id: I52ea5ccb7e7c247abd95e2d8d50dac4c4ad11246
Closes-Bug: #1744741