This is a breaking change as lxc-php should now be called for *each* php
containers we want, with the correct lxc_php_version variable.
Current valid values are :
- php56
- php70
- php73
Other changes includes :
- LXC Containers are created by calling lxc as a dependency of the role.
- Relying on lxc_container module to do commands into the container
(instead of the command module)
- PHP 7.3 container is now a Debian Buster container
- All containers will have opensmtpd to relay emails to postfix on the
host system.
