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

build/tools/repopick.py

@@ -347,7 +347,7 @@ if __name__ == '__main__':
 
         # Print out some useful info
         if not args.quiet:
-            print('--> Subject:       "{0}"'.format(item['subject']))
+            print('--> Subject:       "{0}"'.format(item['subject'].encode('utf-8')))
             print('--> Project path:  {0}'.format(project_path))
             print('--> Change number: {0} (Patch Set {0})'.format(item['id']))