Revert "Multi dest connector (#2647)" (#2696)

Author: xazhao

integration/combination/test_connectors.py

@@ -28,7 +28,6 @@ def tearDown(self):
             ("combination/connector_restapi_to_function",),
             ("combination/connector_httpapi_to_function",),
             ("combination/connector_function_to_bucket_read",),
-            ("combination/connector_function_to_bucket_read_multiple",),
             ("combination/connector_function_to_bucket_write",),
             ("combination/connector_function_to_table_read",),
             ("combination/connector_function_to_table_write",),
@@ -45,8 +44,6 @@ def tearDown(self):
             ("combination/connector_event_rule_to_eb_default_write",),
             ("combination/connector_event_rule_to_eb_custom_write",),
             ("combination/connector_event_rule_to_lambda_write",),
-            ("combination/connector_event_rule_to_lambda_write_multiple",),
-            ("combination/connector_mix_destination",),
             ("combination/connector_sqs_to_function",),
             ("combination/connector_sns_to_function_write",),
             ("combination/connector_table_to_function_read",),