train should be using /etc/os-release for all Linux os detection #685
Description
Linux long ago moved to using /etc/os-release for all operating system information. We moved Chef to this several years ago with Ohai and it's been a great success. We no longer have to add every new operating system as they're released and instead we just use the OS data that comes from /etc/os-release automatically. For our legacy platform names we do a simple remap and for everything new we just use the value out of /etc/os-release. Train should be using this same logic so we can settle on a single detection path and so we don't have to add every new distro to train:
https://github.com/chef/ohai/blob/master/lib/ohai/plugins/linux/platform.rb