app; logging: Change timestamp format
app; logging: Change timestamp format

Previously the timestamp in the logs was seconds.microseconds, while
this is useful for the timestamps in the database, it would perhaps be
nicer to have a more human readable timestamp in the logs.

Thus we now use the following format:

    [YYYY-MM-DD HH:MM:SS tz-offset]

e.g

    [2013-07-04 00:06:38 +0100]

Signed-off-by: Andrew Clayton <02e0a999c50b1f88df7a8f5a04e1b76b35ea6a88@digital-domain.net>

ac000/fcgi_app_core,ac000/fcgi_app_core