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.
uwsgi should not be modified the user, unlike settings.py.  make the user's life easier, and include a COPY command to copy the uwsgi.ini directly into the container, so they don't have to think about moving uwsgi.ini into the right location manually.