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

...eProducer instances by default
Caching isn't an attribute of the JMS version and therefore JMSSupport, JMS 1.0 also supporting caching of Sessions AFAIK.  The limitation here is rather related to the CachingConnectionFactory we are using and that's why ths condition is here.