better compatibility on other OSes

[tschuy]

1. skip service data collection if services can't be collected

2. use a default built-in config (currently just the default as previously found in the repo, just compiled in) if the explicit config file can't be found

For the default built-in, my main question is appropriate warning behavior -- should it have a special err code? Or is the current output text enough?

[tschuy]

@brianredbeard when you have time