Update platforms in Test Kitchen [skip-ci]
Update platforms in Test Kitchen [skip-ci]

opscode-cookbooks/postfix,mawatech/postfix,chrisjbray/postfix,mawatech/postfix,opscode-cookbooks/postfix,chef-cookbooks/postfix,chrisjbray/postfix,gnowxilef/cookbook-postfix,chef-cookbooks/postfix,gnowxilef/cookbook-postfix