[execution][docker] Fix key search in dictionaries

beat/core/execution/docker.py

@@ -227,7 +227,7 @@ class DockerExecutor(RemoteExecutor):
 
             database_paths = {}
 
-            if not self.data.has_key('datasets_root_path'):
+            if 'datasets_root_path' not in self.data:
                 for db_name in self.databases.keys():
                     json_path = os.path.join(root_folder, db_name + '.json')
 
@@ -269,7 +269,7 @@ class DockerExecutor(RemoteExecutor):
             databases_container.add_volume(databases_configuration_path, '/beat/prefix')
             databases_container.add_volume(self.cache, '/beat/cache')
 
-            if not self.data.has_key('datasets_root_path'):
+            if 'datasets_root_path' not in self.data:
                 for db_name, db_path in database_paths.items():
                     databases_container.add_volume(db_path, os.path.join('/databases', db_name))
             else: