fix(integration-tests): fix LoaderSetDummy class

`params` class attribute for `LoaderSetDummy` started to be required
(due introduction of dns_names). Missing it is causing some integration
tests to fail.

This commit adds `params` attribute to `LoaderSetDummy` class with empty
content (as it's not required)

unit_tests/dummy_remote.py

@@ -74,8 +74,8 @@ class LocalLoaderSetDummy(BaseCluster):
     # pylint: disable=super-init-not-called,abstract-method
     def __init__(self, nodes=None):
         self.name = "LocalLoaderSetDummy"
-        self.nodes = nodes if nodes is not None else [LocalNode("loader_node", parent_cluster=self)]
         self.params = {}
+        self.nodes = nodes if nodes is not None else [LocalNode("loader_node", parent_cluster=self)]
 
     @staticmethod
     def get_db_auth():

unit_tests/test_manual.py

@@ -57,6 +57,7 @@ class DbNode:  # pylint: disable=no-init,too-few-public-methods
 class LoaderSetDummy:  # pylint: disable=no-init,too-few-public-methods
     def __init__(self):
         self.nodes = [Node()]
+        self.params = {}
 
     @staticmethod
     def get_db_auth():