log: add file handler for ogLive "real time log"

Clients running in ogLive can show log messages via a lighttp server.
Particularly, a html page named "real time log" consists of <text-area>
tags with the contents of two particular text files
/tmp/session.log and /tmp/command.log

Adds a Python logging handler in order to write ogClient log messages
into /tmp/session.log. This way ogClient logs are show in the "real time
log" html page too.

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