mitchellh/vagrant — pull request #3707 by takekazuomi (2014-05-08 09:08:04+00:00)
Title: fix subprocess external encode issue. 

fix vagrant up failed if interface name include non ASCII character
https://github.com/mitchellh/vagrant/issues/3706

in io.rb
subprocess resuts convert external encoding to utf-8

in subprocess.rb
command line argument convert utf-8 to external encoding