Update the [handler_production] and [logger_root] parameters in
logging.conf in order to ensure the logs are written to the
syslogd daemon.

Update to use the /dev/log socket from the syslogd daemon so that
the logging works for both rsyslog and syslog.

Change-Id: I841f856637b9ca90b446025be6ddaadff7ae06cd
Closes-Bug: #1554871
Signed-off-by: Leonardo Borda <leonardo.borda@canonical.com>