Tweak the node environment variables for plugin testing

- refactor resource configuration
- double check that management is listening after disabling extensions
Test boot step handling and manual enabled-plugins file interventions

- verify enable/disable handles out of sync data in enabled-plugins
- verify that boot/cleanup steps work as expected at runtime
- scope the running node to the test group instead of the suite
Squeeze a bit more parallelism out of those tests
Explain how the test groups are being executed