Restore old logging behaviour

d0ede97d broke the way we were doing logging. Previously, a call to
LoggerList#method would correspond to calls to Logger#method – after the
change, they resulted in Logger#log calls only. This was made under the
assumption that loggers only overwrote the format_* methods – However,
they're also free to overwrite the incoming, outgoing, exception, ...
methods.

This change restores the old behaviour by calling these methods again.