Fix compatibility with gabbi >= 2.7.0

Fix the argument error caused by the change[1] in gabbi 2.7.0 .

[1] https://github.com/cdent/gabbi/commit/8511156559651ab0bf9d2679816d5a7818af290b

Change-Id: I936a3e6ddb0c254069839aaaa1f0eb7d4a72c85d
diff --git a/requirements.txt b/requirements.txt
index 4e6bb28..17f694d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,9 +1,5 @@
-# The order of packages is significant, because pip processes them in the order
-# of appearance. Changing the order has an impact on the overall integration
-# process, which may cause wedges in the gate later.
-
 pbr>=2.0 # Apache-2.0
 oslo.config>=6.0.0 # Apache-2.0
 oslo.utils>=3.37.0 # Apache-2.0
 tempest>=17.1.0 # Apache-2.0
-gabbi>=1.30.0 # Apache-2.0
+gabbi>=2.7.0 # Apache-2.0
diff --git a/telemetry_tempest_plugin/scenario/utils.py b/telemetry_tempest_plugin/scenario/utils.py
index 0904160..9be8fe1 100644
--- a/telemetry_tempest_plugin/scenario/utils.py
+++ b/telemetry_tempest_plugin/scenario/utils.py
@@ -38,7 +38,7 @@
         host='example.com', port=None,
         fixture_module=None,
         intercept=None,
-        handlers=runner.initialize_handlers([]),
+        handlers=runner.initialize_handlers([], []),
         test_loader_name="tempest")
 
     # NOTE(sileht): We hide stdout/stderr and reraise the failure