Add log listener and processor

``otorderd`` runs all the intensive tasks requested by the web app in
the background, with a multiprocessing.Queue listening on port 60000 for
requests from the web app.

``otorderd_logd`` is a true daemon process that logs stuff from
``otorderd``. A log daemon is necessary because there are multiple
processes logging to the same file, and it keeps the messages from being
interleaved.
Improve command handling.

All command line commands for otorderd work, most changes were to
loglevel and verbosity commands. They are independent, so making
verbosity more quiet still allows for log output to be at debug level.