QPID-8074: [JMS AMQP 0-x][System Tests] Run system tests as part of integration-test maven phase

* Change surefire settings to run system tests as part of integration-test maven phase
* Change surefire settings to have separate working directories per amqp protocol
* Describe how to run system tests in README.txt
* Fix typos
* Miscellaneous minor improvements
4 files changed