Revert "CHEF-4028: Use the levels constant from mixlib-log"

This reverts commit 7219db1ff7dbc5fc9c9f29cb43a319ec69c9430a.
Revert "CHEF-4028 - Log resource no longer counts as an updated resource unless a write actually happens"

This reverts commit 77119f0f37cc100d450e4f2d2f9dcfb9a57a74a8.