Add support for eyaml in Hiera

And at the same time remove support for gpg.

The modern version of the configuration (v5) has been tested with 20.04 but
might work with older dists.

global/overlay/etc/puppet/hiera.yaml

@@ -1,21 +1,27 @@
+# Hiera version 5 configuration
+#
 ---
-:backends:
-  - yaml
-  - gpg
+version: 5
+defaults:
+  datadir: /etc/hiera/data
+  data_hash: yaml_data
 
-:logger: console
+hierarchy:
+  - name: "Per-node data"
+    path: "local.yaml"
 
-:hierarchy:
-  - "%{env}/%{location}/%{calling_module}"
-  - "%{env}/%{calling_module}"
-  - local
-  - secrets.yaml
-  - common
+  - name: "Per-group data"
+    path: "group.yaml"
 
+  - name: "Per-host secrets"
+    path: "local.eyaml"
+    lookup_key: eyaml_lookup_key
+    options:
+      pkcs7_private_key: /etc/hiera/eyaml/private_key.pkcs7.pem
+      pkcs7_public_key:  /etc/hiera/eyaml/public_certkey.pkcs7.pem
 
-:yaml:
-   :datadir: /etc/hiera/data
+  - name: "Overrides per distribution"
+    path: "dist_%{::lsbdistcodename}_override.yaml"
 
-:gpg:
-   :datadir: /etc/hiera/data
-   :key_dir: /etc/hiera/gpg
+  - name: "Data common to whole environment"
+    path: "common.yaml"