SWITCHYARD-1630 SOAP component: TRACE log in OutboundHandler.handleMessage(..) doesn't output response message correctly

[https://issues.jboss.org/browse/SWITCHYARD-1630](https://issues.jboss.org/browse/SWITCHYARD-1630)
Just moved the trace logging part to immediately after the `response` object is returned, as `SOAPMessageComposer.compose(..)` method, which is invoked then, imposes destructive effects on the `response` object.