Disable RHEL 6 for now as it times out in Travis
Disable RHEL 6 for now as it times out in Travis

Signed-off-by: Tim Smith <764ef62106582a09ed09dfa0b6bff7c05fd7d1e4@chef.io>

chef-rbenv/ruby_rbenv,sous-chefs/ruby_rbenv,chef-rbenv/ruby_rbenv,chef-rbenv/ruby_rbenv,sous-chefs/ruby_rbenv