Add support for the chrony implementation

Chronyd is installed and configured by default since the Stein
Cycle. This patch adds the support of the latter.

This patch also renames the 'ntpstat' playbook and role by 'ntp' which
is more generic.

Change-Id: Ica0d4af5faa1693baa8f336db71143e0457401f0
Signed-off-by: Gael Chamoulaud <gchamoul@redhat.com>

playbooks/ntp.yaml

@@ -6,9 +6,9 @@
       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.
+        The deployment should configure and run chronyd. This validation verifies
+        that it is indeed running and connected to an NTP server on all nodes.
       groups:
       - post-deployment
   roles:
-    - ntpstat
+    - ntp

roles/ntp/tasks/main.yml

@@ -0,0 +1,26 @@
+---
+- name: Get if chrony is enabled
+  become: True
+  hiera:
+    name: "chrony_enabled"
+
+- when: chrony_enabled|bool
+  block:
+  - name: Populate service facts
+    service_facts: # needed to make yaml happy
+
+  - name: Fail if chronyd service is not running
+    fail:
+      msg: "Chronyd service is not running"
+    when: "ansible_facts.services['chronyd.service'].state != 'running'"
+
+  - name: Run chronyc
+    become: True
+    command: chronyc -a 'burst 4/4'
+    changed_when: False
+
+- name: Run ntpstat
+  # ntpstat returns 0 if synchronised and non-zero otherwise:
+  command: ntpstat
+  changed_when: False
+  when: not chrony_enabled|bool

roles/ntp/vars/main.yml

@@ -4,7 +4,7 @@ metadata:
   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.
+    The deployment should configure and run chronyd. This validation verifies
+    that it is indeed running and connected to an NTP server on all nodes.
   groups:
   - post-deployment

roles/ntpstat/tasks/main.yml

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