chef-ingredient never times out on mixlib-install

[vinyar]

the following code block ends up hanging in air-gapped environment w/o access to internet.

    def install_gem_from_rubygems(gem_name, gem_version)
      Chef::Log.debug("Installing #{gem_name} v#{gem_version} from Rubygems.org")
      chefgem = Chef::Resource::ChefGem.new(gem_name, run_context)
      chefgem.version(gem_version)
      chefgem.run_action(:install)
    end