Add timeout and workers option for Gunicorn.

Add timeout and workers option for Gunicorn,
otherwise long request and multi request won't return.

Closes-Bug: #1652861
Change-Id: If289511c2c64ecb7c09ed14e7862174358052f30
Signed-off-by: Andy Yan <yanchao3@lenovo.com>

valence/cmd/api.py

@@ -45,7 +45,9 @@ class StandaloneApplication(gunicorn.app.base.BaseApplication):
 def main():
     options = {
         'bind': '%s:%s' % (cfg.bind_host, cfg.bind_port),
-        'reload': cfg.debug
+        'reload': cfg.debug,
+        'timeout': cfg.timeout,
+        'workers': cfg.workers
     }
     StandaloneApplication(application, options).run()
     LOG.info(("Valence Server on http://%(host)s:%(port)s"),