Make gunicorn --access-logfile work with custom logging config

Added config option to keep/delete previous logging config. Needed to
make gunicorn --access-logfile work as it uses python logfile module
too.

Author: rouilj

CHANGES.txt

@@ -191,7 +191,9 @@ Fixed:
   can affect calls using requests package or curl. A roundup admin
   would have to write detectors/extensions that use these mechanisms.
   Not exploitable in default config. (John Rouillard)
-
+- Add config option to keep/delete previous logging config. Needed to
+  make gunicorn --access-logfile work as it uses python logfile module
+  too.
 
 2018-07-13 1.6.0
 

roundup/configuration.py

@@ -1031,6 +1031,9 @@ def str2value(self, value):
             "Minimal severity level of messages written to log file.\n"
             "If above 'config' option is set, this option has no effect.\n"
             "Allowed values: DEBUG, INFO, WARNING, ERROR"),
+        (BooleanOption, "disable_loggers", "no",
+            "If set to yes, only the loggers configured in this section will\n"
+            "be used. Yes will disable gunicorn's --access-log.\n"),
     )),
     ("mail", (
         (Option, "domain", NODEFAULT,
@@ -1738,7 +1741,8 @@ def reset(self):
     def init_logging(self):
         _file = self["LOGGING_CONFIG"]
         if _file and os.path.isfile(_file):
-            logging.config.fileConfig(_file)
+            logging.config.fileConfig(_file,
+                   disable_existing_loggers=self["LOGGING_DISABLE_LOGGERS"])
             return
 
         _file = self["LOGGING_FILENAME"]