This script grabs all available job counters from the HistoryServer once
a workflow finishes, and transforms them according to configuration,
making them suitable to then ship to a local statsd endpoint.

The script will collect all available counters - default and custom -
and convert their Java-esque names to a simpler format.  It also allows
multiple "templates" to be defined, which allows generating multiple
output metrics (which allow dimensions to be added, removed, for
aggregation, etc) from a single input metric.