distro: add render_interface_ovsport().
Merge branch 'feature-interface-ovsport'
utils: add basearch().
distro: use basearch() in add_option_distro().
Merge branch 'feature-basearch'
distro: update rhel6 to 6.4.
distro: update centos mirror site.
Merge branch 'update-rhel6-version'
Merge pull request #9 from hansode/master

update rhel6