Add chrony for time sync for Azure image

Chrony is the only way to sync time from host using PTP source according to the azure team

images/capi/packer/azure/packer.json

@@ -117,6 +117,12 @@
         "--extra-vars",
         "{{user `ansible_extra_vars`}}"
       ]
+    },
+    {
+      "type": "shell",
+      "inline": [
+        "sudo apt-get -qq update && sudo apt-get -qqy install chrony &&  sudo systemctl restart chrony.service"
+      ]
     }
   ]
-}
+}