Remove dead code from Chef::CookbookVersion

Removed in f880869c93548bbcded6e53d3d98dce61e8d7fa3, but apparently accidently
slipped back by mistake in merge b36f636267d74e1004c043501f652448f02ee747
CHEF-3045: Re-provide lost support for no_lazy_load

Originally added in 1938b77, but the move of the cookbook sync code
in f880869c93 got messed up in bad merge b36f636

Also, add something test-like.