QPID-4566 Allow a non UUID String to be set as message-id. This is
required when Qpid Messages are sent using a 3rd party JMS Message
Producer. Ex a Message Bridge. This doesn't
affect AMQP 0-10 compliance as the sender implementation will always
assign an UUID string as the message-id.

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1442364 13f79535-47bb-0310-9956-ffa450edef68