[boost] [python] Missing test file.

FYI.. The testing CI sanity check is failing with this missing file error: error: Unable to find file or target named error: 'printer.py' error: referred to from project at error: '../libs/python/test' https://travis-ci.org/boostorg/boost/jobs/166196326#L6960 Please fix ASAP. -- -- Rene Rivera -- Grafik - Don't Assume Anything -- Robot Dreams - http://robot-dreams.net -- rrivera/acm.org (msn) - grafikrobot/aim,yahoo,skype,efnet,gmail