Block until timedatectl status show synchronized

Should reduce incidents of time sync issues when running kolla
pre-checks.

Change-Id: Iad7fc73f16ffcbc2ab5f261322bd6777036fd5f6
Signed-off-by: Will Szumski <will@stackhpc.com>
(cherry picked from commit f23ced2)

Author: jovial

ansible/roles/ntp/tasks/sync.yml

@@ -23,4 +23,13 @@
 
     - name: Force hardware clock synchronisation
       command: hwclock --systohc
+
+    - name: Wait for system clock to be synchronized (up to 10 minutes)
+      become: True
+      ansible.builtin.command: timedatectl show --property=NTPSynchronized --value
+      register: sync_check
+      until: sync_check.stdout | trim == "yes"
+      retries: 60
+      delay: 10
+      failed_when: sync_check.rc != 0
   when: ntp_force_sync | bool

releasenotes/notes/block-until-timedatectl-synchronized-4b0243df78e72550.yaml

@@ -0,0 +1,9 @@
+---
+fixes:
+  - |
+    Reduces clock synchronisation race conditions before running Kolla by
+    waiting for ``timedatectl`` to report ``NTPSynchronized=yes`` when
+    ``ntp_force_sync`` is enabled.
+
+    This improves reliability of deployments where services are sensitive to
+    clock skew immediately after NTP configuration.