Create Dockerfile for Kronos

Docker has 3 kronos services, one for all, one for readonly, one for collector. When docker is run, all three are started. Three ports are mapped. The log directory is mapped to `/var/log/kronos`. Settings file at `/etc/kronos/settings.py` is mapped into the docker.
this file was for ubuntu installation, and so we shouldn't ditch the settings.py copying.  let's make it a flag to exclude it, and include that flag in the Dockerfile