Fix print & add more informative logging

Summary: Fix fairseq's `force` option for disabling print suppression (otherwise, `print(..., force=True)` fails on master since the force kwarg gets passed to the builtin print).

Reviewed By: dpacgopinath

Differential Revision: D10522058

fbshipit-source-id: bbc10c021a7d21396ebfbb1bf007f6b9b162f4fd