Allow the default project change list query to be customized

Change-Id: I84a5f701db52425ddbeac566eed45889a98a685b

gertty/config.py

@@ -89,6 +89,7 @@ class ConfigSchema(object):
                            'commentlinks': self.commentlinks,
                            'dashboards': self.dashboards,
                            'reviewkeys': self.reviewkeys,
+                           'change-list-query': str,
                            })
         return schema
 
@@ -141,6 +142,8 @@ class Config(object):
                                 text="{url}",
                                 url="{url}"))])))
 
+        self.project_change_list_query = self.config.get('change-list-query', 'status:open')
+
         self.dashboards = OrderedDict()
         for d in self.config.get('dashboards', []):
             self.dashboards[d['key']] = d