Add ntpstat role

This patch adds the ntpstat role created from
validations/ntpstat.yaml.

Change-Id: I9af242427b513c38b3a2ed9e931500941c3a51df
Implements: blueprint validation-framework
Signed-off-by: Gael Chamoulaud <gchamoul@redhat.com>

playbooks/ntpstat.yaml

@@ -0,0 +1,14 @@
+---
+- hosts: overcloud
+  vars:
+    metadata:
+      name: Verify all deployed nodes have their clock synchronised
+      description: >
+        Each overcloud node should have their clocks synchronised.
+
+        The deployment should configure and run ntpd. This validation verifies
+        that it is indeed running and connected to an NPT server on all nodes.
+      groups:
+      - post-deployment
+  roles:
+    - ntpstat

roles/ntpstat/meta/main.yml

@@ -0,0 +1,28 @@
+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/ntpstat/tasks/main.yml

@@ -0,0 +1,5 @@
+---
+- name: Run ntpstat
+  # ntpstat returns 0 if synchronised and non-zero otherwise:
+  command: ntpstat
+  changed_when: False

roles/ntpstat/vars/main.yml

@@ -0,0 +1,10 @@
+---
+metadata:
+  name: Verify all deployed nodes have their clock synchronised
+  description: >
+    Each overcloud node should have their clocks synchronised.
+
+    The deployment should configure and run ntpd. This validation verifies
+    that it is indeed running and connected to an NPT server on all nodes.
+  groups:
+  - post-deployment