zopewsgi: setup logging before loading ZConfig

Loading ZConfig will initialize storage and generally might do things
that will cause messages to be emitted.
One actual problem is with neo storage, which configure root logger
when it's not already configured [1], this was causing all logged
messages to be logged in the console when using neo storage.

1: https://lab.nexedi.com/nexedi/neoppod/blob/fd87e153/neo/lib/logger.py#L63-64

product/ERP5/bin/zopewsgi.py

@@ -184,13 +184,6 @@ def runwsgi():
       default=type_registry.get('byte-size')("10MB"))
     args = parser.parse_args()
 
-    startup = os.path.dirname(Zope2.Startup.__file__)
-    if os.path.isfile(os.path.join(startup, 'wsgischema.xml')):
-      schema = ZConfig.loadSchema(os.path.join(startup, 'wsgischema.xml'))
-    else: # BBB Zope2
-      schema = ZConfig.loadSchema(os.path.join(startup, 'zopeschema.xml'))
-    conf, _ = ZConfig.loadConfig(schema, args.zope_conf)
-
     # Configure logging previously handled by ZConfig/ZServer
     logging.captureWarnings(True)
     root_logger = logging.getLogger()
@@ -221,6 +214,13 @@ def runwsgi():
       LongRequestLogger_dumper.logger.propagate = False
       LongRequestLogger_dumper.logger.addHandler(long_request_log_handler)
 
+    startup = os.path.dirname(Zope2.Startup.__file__)
+    if os.path.isfile(os.path.join(startup, 'wsgischema.xml')):
+      schema = ZConfig.loadSchema(os.path.join(startup, 'wsgischema.xml'))
+    else: # BBB Zope2
+      schema = ZConfig.loadSchema(os.path.join(startup, 'zopeschema.xml'))
+    conf, _ = ZConfig.loadConfig(schema, args.zope_conf)
+
     if conf.debug_mode:
       console_handler = logging.StreamHandler(sys.stderr)
       console_handler.setFormatter(logging.Formatter(