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.