Script to generate initial GenericJMX configs from .tmpl files

[ekilby]

We have handy files that list mBeans and attributes. We want to have GenericJMX support for all of the services in those files. This script does the initial translation.

After running it, some hand steps remain. All variables are marked as gauge so some will need to change to counter as appropriate. Also, wildcarded beans will need the "InstanceFrom" set to the appropriate wildcard value so the metric names will be made properly with the wildcard matches.