Decide how to manage ecours and other systems with Puppet

Now that we’re very soon going to have 2+ machines, we need to decide about what Puppet master they’ll use, and if they’re not going to use lizard’s then we need to decide about their Puppet tree Git repo.

Related issues

Related to #11094 (closed)
Has duplicate #10245 (closed)
Blocks #9484 (closed)
Blocks #8647 (closed)
Blocks #6250 (closed)

Original created by @intrigeri on 10760 (Redmine)

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information