test_logger.rb: clear garbage files
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43577 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
test_logger.rb: clear garbage files
unlink rotated log files all.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43577 b2dd03c8-39d4-4d8f-98ff-823fe69b080e