Merge branch 'enc-edits' into 'master'

[Flycheck]: http://flycheck.org/

[vim-puppet]: https://github.com/rodjek/vim-puppet

### ENC

### External Node Classifier (ENC)

ENC stands for External Node Classifier. When implemented, as is the

case here, it causes the Puppet server to request information about

a node before its catalog is compiled.

We use an External Node Classifier (or ENC for short) to classify

nodes in different roles but also assign them environments and other

variables. The way the ENC works is that the Puppet server requests

information from the ENC about a node before compiling its catalog.

It can be used on the Puppet server to define three elements about

nodes:

The Puppet server pulls three elements about nodes from the ENC:

 * **Environment**: is the standard way to assign nodes to a

 Puppet environment. The default is `production` which is the only

 * `environment` is the standard way to assign nodes to a Puppet

   environment. The default is `production` which is the only

   environment currently deployed.

 * **Parameters**: is a hash where each key is made available as a

 top-scope variable in a node's manifests. We use this assign a unique

 role to each node. This role is in turn used to include a `role::foo`

 class which should only consist of a set of profile classes.

 * **Classes**: is an array of class names which Puppet includes

 on the target node. We are currently transitioning from this method

 of including classes on nodes (previously in Hiera) to the `role`

 * `parameters` is a hash where each key is made available as a

   top-scope variable in a node's manifests. We use this assign a

   unique "role" to each node. The way this works is, for a given role

   `foo`, a class `role::foo` will be included. That class should only

   consist of a set of profile classes.

 * `classes` is an array of class names which Puppet includes on the

   target node. We are currently transitioning from this method of

   including classes on nodes (previously in Hiera) to the `role`

   parameter and unique role classes.

These elements are defined in `/etc/puppet/hiera-enc/nodes/$fqdn.yaml`.

For a given node named `$fqdn`, these elements are defined in

`tor-puppet.git/hiera-enc/nodes/$fqdn.yaml`. Defaults can also be set

in `tor-puppet.git/hiera-enc/nodes/default.yaml`.

#### Role classes