Add qos optional feature for disk I/O operations

This test checks if qos feature can be turned on or off for
disk I/O operations

Change-Id: I60626e8d53eaa5d11fff5111c0cde91008669bdd

oswin_tempest_plugin/tests/scenario/test_qos.py

@@ -0,0 +1,31 @@
+# Copyright 2017 Cloudbase Solutions SRL
+# All Rights Reserved.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+from oswin_tempest_plugin.tests._mixins import optional_feature
+from oswin_tempest_plugin.tests import test_base
+
+
+class QosTestCase(test_base.TestBase,
+                  optional_feature._OptionalFeatureMixin):
+    """QoS test suite.
+
+    This test suite will spawn instances with QoS specs.
+
+    Hyper-V uses normalized IOPS (8 KB increments), and the minimum IOPS that
+    can be set is 1.
+    """
+
+    _FEATURE_FLAVOR = {
+        'extra_specs': {'quota:disk_total_bytes_sec': '200'}}