The current rabbit tests post a message on one unit and then
consumes the first message on another unit. If the two do not match
then the test fails. This means that a single pre-existing message
can break all these tests as the consumer always gets the wrong
message. This change updates the tests to search for the target
message rather than assuming that the first message is the target
message.
Messages that are not the target message are not reposted so any
pre-existing messages are consumed and in effect thrown away but
given these are all test messages in a test queue and the tests do
not run in parallel this should be fine.
Liam Young
908f0b4a3b