(maint) bump java-jmx dependency to 0.3.1
(maint) bump java-jmx dependency to 0.3.1

This brings eliminates a conflict with the status and metrics services.

puppetlabs/trapperkeeper-webserver-jetty9,camlow325/trapperkeeper-webserver-jetty9,camlow325/trapperkeeper-webserver-jetty9,rlinehan/trapperkeeper-webserver-jetty9,rlinehan/trapperkeeper-webserver-jetty9,puppetlabs/trapperkeeper-webserver-jetty9