debian: configure journald filters and formatter (#30613)

In order to get logs:
* on par with syslog for the message,
* with structured fields for requests/tenants informations.

debian/debian_config_common.py

@@ -168,6 +168,8 @@ if os.path.exists('/run/systemd/journal/socket'):
     else:
         LOGGING['handlers']['journald'] = {
             'class': 'hobo.journal.JournalHandler',
+            'filters': ['request_context'],
+            'formatter': 'syslog',
         }
         LOGGING['loggers']['']['handlers'].remove('syslog')
         LOGGING['loggers']['']['handlers'].append('journald')