Merge pull request #14 from jhesketh/master

Remove the admin group from the th_user
Added an RCBAU version of the exim4.conf file used by openstack-infra.
I used a resource collector, to modify the exim config from the ::exim module
our rcbau::server module.
Merge pull request #15 from jhesketh/master

Change container for v2
Changed to exim.conf file to allow localhost to send unqualified senders.
Which allows zuul to send email with the sender as only zuul (no domain).
Revert "Remove unused baseline and flavour params"

This reverts commit 8c20fc195987512f25bd46fe2eb4516e0059807c.