AMQP: send messages with persistent: true

[bergie]

We're using durable queues in MsgFlo, but messages are not sent by default with the persistent: true flag, causing them to be lost in case AMQP broker reboots.

http://rubybunny.info/articles/durability.html

[jonnor]

Should it be default on?
We're gonna have trouble supporting it with some other brokers, as the concept may not exist.
Configurable via a participant-wide flag on commandline OK?

[bergie]

sounds good