Ensure that integer chef config attributes get placed in solo.rb/client.rb properly

eg yum_timeout: https://github.com/mojolingo/lumenvox-chef/commit/4e04704f8525e7a9e86035d6c75c47e5e403b5a5

This ends up with `yum_timeout 3600` rather than `yum_timeout "3600"` in solo.rb, while retaining compatibility for String/Array values.