nri-jmx add support for connectors on windows

[cristianciutea]

We should check if we can add support for nri-jmx connectors on windows.
On linux we add the ./connectors/* in the classpath (in nrjmx bash script located in nrjmx/bin)
On windows we don't do that and we need to check if we can add them in the same way as in the linux version (but in the nrjmx.bat script)
To test this, you can spawn a linux container on Windows using this tutorial: https://github.com/newrelic/nri-jmx/tree/master/docs/jboss-standalone-tutorial