ACTIVEMQ6-5 Replace 3rd party CatX deps with CatA

This PR is a first pass at removing 3rd party library dependencies with Category X licenses.  There is still some work to be done in order for us to be completely Apache compliant with regards to 3rd party licenses as outlined here: http://www.apache.org/legal/3party.html

Only those libraries where a straight swap could be found have been replaced in this PR.  Please see notes added to comments that highlight the dependencies that still exist in the project.