Move contents of ChefObject#chef_init into an initializer

If the chef settings stay constant throughout the app life cycle, they
can be safely moved into an initializer.

Move ChefObject#chef_init into config/initializers/chef.rb, then remove
references to this method from the code.

Update the tests so they keep passing.
Merge pull request #903 from bkutil/move_chef_init_to_initializer

Move contents of ChefObject#chef_init into an initializer