Add stonith-exists role

This patch adds this role created from
validations/stonith-exists.yaml.

Change-Id: I34e8d5128ec5260e699c506336fa36f5a61ea546
Implements: blueprint validation-framework
Signed-off-by: Gael Chamoulaud <gchamoul@redhat.com>

playbooks/stonith-exists.yaml

@@ -0,0 +1,14 @@
+---
+- hosts: Controller
+  vars:
+    metadata:
+      name: Validate stonith devices
+      description: >
+        Verify that stonith devices are configured for your OpenStack Platform HA cluster.
+        We don't configure stonith device with TripleO Installer. Because the hardware
+        configuration may be differ in each environment and requires different fence agents.
+        How to configure fencing please read https://access.redhat.com/documentation/en/red-hat-openstack-platform/8/paged/director-installation-and-usage/86-fencing-the-controller-nodes
+      groups:
+        - post-deployment
+  roles:
+    - stonith-exists

roles/stonith-exists/meta/main.yml

@@ -0,0 +1,27 @@
+galaxy_info:
+  author: TripleO Validations Team
+  company: Red Hat
+  license: Apache
+  min_ansible_version: 2.4
+
+  platforms:
+  - name: CentOS
+    versions:
+    - 7
+  - name: RHEL
+    versions:
+    - 7
+
+  categories:
+    - cloud
+    - baremetal
+    - system
+  galaxy_tags: []
+    # List tags for your role here, one per line. A tag is a keyword that describes
+    # and categorizes the role. Users find roles by searching for tags. Be sure to
+    # remove the '[]' above, if you add tags to this list.
+    #
+    # NOTE: A tag is limited to a single word comprised of alphanumeric characters.
+    #       Maximum 20 tags per role.
+
+dependencies: []

roles/stonith-exists/tasks/main.yml

@@ -0,0 +1,22 @@
+---
+- name: Check if we are in HA cluster environment
+  become: True
+  register: pcs_cluster_status
+  command: pcs cluster status
+  failed_when: false
+  changed_when: false
+
+- name: Get all currently configured stonith devices
+  become: True
+  command: "pcs stonith"
+  register: stonith_devices
+  changed_when: false
+  when: "pcs_cluster_status.rc == 0"
+
+- name: Verify the stonith device are configured
+  fail:
+    msg: "Stonith devices are not configured."
+  when: >
+    pcs_cluster_status.rc == 0
+    and
+    'NO stonith devices configured' in stonith_devices.stdout

roles/stonith-exists/vars/main.yml

@@ -0,0 +1,10 @@
+---
+metadata:
+  name: Validate stonith devices
+  description: >
+    Verify that stonith devices are configured for your OpenStack Platform HA cluster.
+    We don't configure stonith device with TripleO Installer. Because the hardware
+    configuration may be differ in each environment and requires different fence agents.
+    How to configure fencing please read https://access.redhat.com/documentation/en/red-hat-openstack-platform/8/paged/director-installation-and-usage/86-fencing-the-controller-nodes
+  groups:
+    - post-deployment