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.
kronos/scripts/install_kronosd.py does not exist solely for the docker---by deleting the code above, we break direct installs on ubuntu systems.

to avoid this, put the code you deleted behind a command-line flag to `kronos/scripts/install_kronosd.py`, which you can pass when installing on Docker.