MULE-7731 JMS transport should reuse javax.jms.Session, javax.jms.Messag...

...eProducer instances by default
I want to verify that connection is created before message is sent and that no additional connection is created when message is sent.  If I just put verify afterwards I'm not verifying when it was created and if I just put it before I'm not verifiying that no additional connections were created.