We already have a testbed configuration file and this new file will contain other configurable aspects. The cmdline args and env vars could go into this file as well. New configuration options include default IP addresses and any other string values that tests use. There could be test-specific configuration files. It may be worth implementing the general config file with this in mind (so that we can reuse the code).
Add: default ip addresses It would be beneficial to print the global configuration, and testsuite configuration.