fix grains generation

linux/files/sphinx.grain

-sphinx:
+{%- set grains = {'sphinx': {'doc': {}}} %}
 {%- for service_name, service in pillar.items() %}
 {%- if service.get('_support', {}).get('sphinx', {}).get('enabled', False) %}
 {%- set grains_fragment_file = service_name+'/meta/sphinx.yml' %}
 {%- macro load_grains_file() %}{% include grains_fragment_file %}{% endmacro %}
 {%- set grains_yaml = load_grains_file()|load_yaml %}
-  {{ service_name }}: {{ grains_yaml|yaml }}
+{%- set _dummy = grains.sphinx.doc.update({ service_name: grains_yaml.doc }) %}
 {%- endif %}
 {%- endfor %}
+{{ grains|yaml(False) }}

linux/meta/sphinx.yml

         name:
           value: {{ system.name }}
         kernel:
-          value: {{ grains.kernel }} {{ grains.kernelrelease }}
+          value: {{ salt['grains.item']('kernel')['kernel'] }} {{ salt['grains.item']('kernelrelease')['kernelrelease'] }}
         distribution:
-          value: {{ grains.lsb_distrib_description }}
+          value: {{ salt['grains.item']('lsb_distrib_description')['lsb_distrib_description'] }}
     network:
       name: Network
       param:
           value: {{ network.fqdn }}
         ip:
           name: IP Addresses
-          value: {{ grains.ipv4 }}
+          value: {{ salt['grains.item']('ipv4')['ipv4'] }}