logging: Remove logging.conf, use log_dir only

Phase 1 of 2. This removes the custom logging configuration and should unblock any debugging efforts.
@craigtracey @paulczar 
this isn't needed here and causes errors.    keystone service is enabled/started as part of the controller role here - https://github.com/blueboxgroup/ursula/blob/master/roles/controller/tasks/keystone.yml#L2-L6