BMUnit is ignoring port configuration setting

Currently, the BMUNit package fails to test system property org.jboss.byteman.contrib/bmunit.agent.port and use it to configure i) the port passed to the agent when it is installed and ii) the port used when test rules are installed or uninstalled.

Also, class Install ignores any port value provided via its install() API method, instead always installing the agent using the default port.