repopick: encode commit subjects in utf-8 for printing

* Fixes errors like UnicodeEncodeError: 'ascii' codec can't encode
  character u'\xb0' in position 51: ordinal not in range(128) with weird
  characters in a commit message

Change-Id: I700198481630b4b29fd6d5d1f0c79bb94e59ad86
1 file changed