Rogue print statement in ini_reader.py

[rplzzz]

I found this while tracking down something for Tom:

https://github.com/JGCRI/xanthos/blob/754f111939c0611c17ac846f5bd407b5780a2d14/xanthos/data_reader/ini_reader.py#L606

I believe the best practice would be to change print(...) to logging.warning(...)

Also, I grepped the rest of the source for instances of print, and this is the only one.