Set the default cache timeout to 300 seconds as stated in the documentation

Closes #15160
(grafted from eda9f5c7918eeaf17f97bc7c75c50dedef9964ae)

--HG--
branch : 8.0

trytond/trytond/config.py

@@ -104,7 +104,7 @@ class TrytonConfigParser(configparser.ConfigParser):
         self.add_section('bus')
         self.set('bus', 'allow_subscribe', 'False')
         self.set('bus', 'long_polling_timeout', str(5 * 60))
-        self.set('bus', 'cache_timeout', '5')
+        self.set('bus', 'cache_timeout', str(5 * 60))
         self.set('bus', 'select_timeout', '5')
         self.add_section('report')
         self.add_section('html')