Send everything in production through the gunicorn logger (allows rotation using USR1). Add a gunicorn logger that emits the logstash format. Move the gunicorn config to the conf subdir. Update the postrotate script to hopefully work.

util/glogger.py

@@ -0,0 +1,23 @@
+import logging
+import logstash_formatter
+import gunicorn.glogging
+
+from gunicorn import util
+
+class LogstashLogger(gunicorn.glogging.Logger):
+  def _set_handler(self, log, output, fmt):
+    # remove previous gunicorn log handler
+    h = self._get_gunicorn_handler(log)
+    if h:
+      log.handlers.remove(h)
+
+    if output is not None:
+      if output == "-":
+        h = logging.StreamHandler()
+      else:
+        util.check_is_writeable(output)
+        h = logging.FileHandler(output)
+
+      h.setFormatter(logstash_formatter.LogstashFormatter())
+      h._gunicorn = True
+      log.addHandler(h)