ETF configuration from PWA
Top level ticket for developing ETF PS to be configured from PWA-only. This'll need at least the following:
- add env/arg to specify PWA address (or multiple addresses)
- write a generic ETF plugin that will take and process multiple PWA endpoints and auto-configures the tests
- some way how test params can be passed to container (or to ETF plugin, maybe via ncgx.cfg ?)
- separate container (and ETF plugin) to configure WLCG/OSG instance
- publish container in dockerhub
- determine how to detect service types and how to assign existing tests to those service types