(maint) Update Puppetfile versions, update style

This commit updates the Puppetfile example module versions to list the
latest releases for the example modules as of 2019-07-10, and also
updates several files for style.

Standardizing on double-quotes in YAML due to:

1. Functional irrelevance between single vs. double quotes in our YAML
2. Prevalent use of double-quotes in Puppet documentation
3. Similar look-and-feel to other data serialization formats like JSON

1 files changed, 2 insertions, 2 deletions

diff --git a/hiera.yaml b/hiera.yaml
index 912ba45..0f5c657 100644
--- a/hiera.yaml
+++ b/hiera.yaml
@@ -5,8 +5,8 @@ defaults:
   datadir: "data"
 
 hierarchy:
-  - name: 'Yaml backend'
+  - name: "Yaml backend"
     data_hash: yaml_data
     paths:
       - "nodes/%{trusted.certname}.yaml"
-      - 'common.yaml'
+      - "common.yaml"