ARTEMIS-1566 Openwire client can't receive compressed messages

[gaohoward]

When openwire client uses compressed option to send messages
(jms.useCompression=true) openwire client failed to receive them.
The reason is in OpenwireMessageConverter.toAMQMessage():

1. message.setContent() should be called after setting properties
   (It will cause the compressed content to decompressed before delivering to clients)
2. message.onSend() should not be called here (it should be used
   by producers. If used here it changes the internal flags of the
   message and cause receive to fail).