Fix autofs service resource for Ubuntu 14.04.

Use upstart for autofs on Ubuntu 12.04, too.
Expose layers and hosts in opsworks.js.
Unicorn should run using the user space ruby installation.

cr https://cr.amazon.com/r/2365416/
Make the port for Node.js apps configurable and make it available to apps as PORT environment variable.
Add X-Request-Start header to nginx/unicorn Rails app configuration for NewRelic request queueing
Test whether RAID is considered as clean.
Remove berkshelf cookbooks before running `berks vendor` again.
Include berkshelf's output in the Chef log.
Allow passing --debug to Berkshelf cookbook installation command.
Update list of versions for prebuild berkshelf packages.

cr https://cr.amazon.com/r/2385869/
Fix removal of berkshelf cookbooks when manage_berkshelf is false.
Add create_dirs_before_symlink as app attribute.