* The module now correctly sets the timezone in both the config file and
in /etc/localtime; while hwclock is set in both the config and
/etc/adjtime.
* Module checks if the timezone is actually set by checking
/etc/localtime. Before it only checked if it was set in the config file.
* Fixed module not setting the timezone on RedHat systems if
/etc/localtime was a symbolic link.
* Fixed module failures in case of missing config files or incorrect data
in them.
* Added a lot of integrations tests to cover most of these situations.
* 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
