Improved control over AMQP versions tried

The qpid::messaging client defaults to 0-10, though the version can be explicitly specified also. If the broker doesn't support 0-10, but does support 1.0 and assuming that 1.0 support in the client is enabled and the application didn't explicitly request 0-10, the client should try 1.0.

This would make interoperability easier as it wouldn't require specific connection options to choose 1.0.