feat(map): generate a YAML file to validate map.jinja

We provide a new `_mapdata` state which generate a
`/tmp/salt_mapdata_dump.yaml` to be validated by `Inspec`.

TEMPLATE/_mapdata/_mapdata.jinja

@@ -0,0 +1,13 @@
+# yamllint disable rule:indentation rule:line-length
+# {{ grains.get('osfinger', grains.os) }}
+---
+{#- use salt.slsutil.serialize to avoid encoding errors on some platforms #}
+{{ salt['slsutil.serialize'](
+     'yaml',
+     map,
+     default_flow_style=False,
+     allow_unicode=True,
+   )
+   | regex_replace("^\s+'$", "'", multiline=True)
+   | trim
+}}

TEMPLATE/_mapdata/init.sls

@@ -0,0 +1,18 @@
+# -*- coding: utf-8 -*-
+# vim: ft=sls
+---
+{#- Get the `tplroot` from `tpldir` #}
+{%- set tplroot = tpldir.split('/')[0] %}
+{%- from tplroot ~ "/map.jinja" import TEMPLATE as mapdata with context %}
+
+{%- do salt['log.debug']('### MAP.JINJA DUMP ###\n' ~ mapdata | yaml(False)) %}
+
+{%- set output_file = '/tmp/salt_mapdata_dump.yaml' %}
+
+{{ tplroot }}-mapdata-dump:
+  file.managed:
+    - name: {{ output_file }}
+    - source: salt://{{ tplroot }}/_mapdata/_mapdata.jinja
+    - template: jinja
+    - context:
+        map: {{ mapdata | yaml }}