Handle timezone updates on Ubuntu 16.04+ on containers (#27546)

* Handle timezone updates on Ubuntu 16.04+ on containers

Although Ubuntu 16.04 will use timedatectl by default,
containers without a working timedatectl need to use the
old method.

A bug in Ubuntu for the old method means having to write
a nasty hack

https://bugs.launchpad.net/ubuntu/+source/tzdata/+bug/1554806

* Add tests for timezones

Ensure timezone changes work across various OSs

test/integration/targets/timezone/tasks/main.yml

@@ -0,0 +1,15 @@
+- name: set timezone to Etc/UTC
+  timezone:
+    name: Etc/UTC
+
+- name: set timezone to Australia/Brisbane
+  timezone:
+    name: Australia/Brisbane
+  register: timezone_set
+
+- name: ensure timezone changed
+  assert:
+    that:
+      - timezone_set.changed
+      - timezone_set.diff.after.name == 'Australia/Brisbane'
+      - timezone_set.diff.before.name == 'Etc/UTC'