Add load testing node that can be configured to test SiteWhere performance
There is no standard method of load testing SiteWhere. While there are multithreaded tests for various protocols, they are not geared toward spreading the load across multiple machines for a true stress test. A new SiteWhere load test node should be created so that it can be deployed on multiple machines. The load test node should be highly configurable and should be designed such that it can be used as a Juju charm and scaled alongside the SiteWhere charm.