Tidy up README
Remove some openstack specific parts
Add a message of the day template
use motd to warn about using puppet config
Remove unused th_local_dataset_path variable
Fix erroneous whitespace
Remove MySQL reporter from zuul

Currently our version of zuul is patched to support logging to MySQL.
This still hasn't landed in upstream zuul so we just won't bother for
now. (additionally the zuul-server was never set up with MySQL for
this anyway).

See https://review.openstack.org/#/c/65885/
Start zuul services

We can scale out mergers horizontally, but for now just start both
the zuul-server and 1 zuul-merger on the same instance. This should
be more than adequet for our uses.
Merge pull request #1 from jhesketh/master

Small tidy-ups, nothing major