INT-2999 Add BeanResolvers to AMQP OB Endpoints

Expressions (routing key, exchange, correlation data) did
not resolve beans. Need to add the BeanFactory (if present)
to the MessageProcessors.

Add test case.
Merge pull request #794 from garyrussell/INT-2999

* INT-2999: Add BeanResolvers to AMQP OB Endpoints