Add compute microversion 2.61 schema in flavors_client

Compute microversion 2.61 adds 'extra_specs' in flavor APIs response
This commit fill the schema gap for that.

Change-Id: Id1f1e51fbae1cc3d0c9efdcd9009f384745915d6
diff --git a/tempest/lib/services/compute/flavors_client.py b/tempest/lib/services/compute/flavors_client.py
index 4923d7e..a699579 100644
--- a/tempest/lib/services/compute/flavors_client.py
+++ b/tempest/lib/services/compute/flavors_client.py
@@ -23,6 +23,8 @@
     as schema_extra_specs
 from tempest.lib.api_schema.response.compute.v2_55 import flavors \
     as schemav255
+from tempest.lib.api_schema.response.compute.v2_61 import flavors \
+    as schemav261
 from tempest.lib.common import rest_client
 from tempest.lib.services.compute import base_compute_client
 
@@ -31,7 +33,8 @@
 
     schema_versions_info = [
         {'min': None, 'max': '2.54', 'schema': schema},
-        {'min': '2.55', 'max': None, 'schema': schemav255}]
+        {'min': '2.55', 'max': '2.60', 'schema': schemav255},
+        {'min': '2.61', 'max': None, 'schema': schemav261}]
 
     def list_flavors(self, detail=False, **params):
         """Lists flavors.