better framework for command line usage

[hyperthunk]

Currently you can run the systest escript and that's about it. There are open issues to deal with things like cleaning up log files and locating test artefacts on the file system. There are probably, however, other usage patterns that would make sense:

• controlling the test coordinator (e.g., starting/stopping profiles or resources)
• triggering actions (when that API becomes available in stable)
• generating resource and other useful artefacts
• etc.....

So either we need to have the main escript take multiple commands, or we need to think about wrapping it with other executables (e.g., scripts, batch files or whatever).