[service_status] Add role documentation in sphinx

This patch adds the documentation directly in the sphinx role
documentation index. All variables have been commented with a proper
description to be included automatically in the sphinx build.

This patch also disables the facts gathering because this validation is
only using the package_facts.

Change-Id: I9ebed531fba6966a4122f0c55eac784cbb6954cc
Signed-off-by: Gael Chamoulaud (Strider) <gchamoul@redhat.com>

doc/source/roles/role-service_status.rst

@@ -2,5 +2,45 @@
 service_status
 ==============
 
+--------------
+About The Role
+--------------
+
+An Ansible role to detect services status on the target host(s).
+
+Requirements
+============
+
+No requirements.
+
+Dependencies
+============
+
+No dependencies.
+
+Example Playbook
+================
+
+.. code-block:: yaml
+
+   - hosts: localhost
+     gather_facts: false
+     roles:
+       - service_status
+
+License
+=======
+
+Apache
+
+Author Information
+==================
+
+**Red Hat TripleO DFG:DF Squad:VF**
+
+----------------
+Full Description
+----------------
+
 .. ansibleautoplugin::
    :role: validations_common/roles/service_status

validations_common/playbooks/service-status.yaml

@@ -1,5 +1,6 @@
 ---
 - hosts: all
+  gather_facts: false
   vars:
     metadata:
       name: Ensure services state

validations_common/roles/service_status/defaults/main.yaml

@@ -1,2 +1,3 @@
 ---
+# Podman command options
 service_status_podman_opt: ''