It turned out that merely configuring the root logger is not enough for
"catch-all" semantics. The logging subsystem also needs to be told not
to disable existing loggers (so that their messages will get propagated
to handlers up the logging hierarchy, not just silently discarded).

Signed-off-by: Ivan Shapovalov <intelfx100@gmail.com>

The added logger configuration (--log-config or log_config:) uses
systemd's python bindings to pass messages directly to the journal.

Signed-off-by: Ivan Shapovalov <intelfx100@gmail.com>