Add config file for performance gate job

This job is called gate-rally-dsvm-fakevirt-heat.
Also added readme and plugin sample.

Change-Id: Ic4f482e566f3552b3fdf7129b8447e7def036441

rally-scenarios/README.rst

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+This directory contains rally benchmark scenarios to be run by OpenStack CI.
+
+Structure:
+* heat.yaml is rally task that will be run in gates
+* plugins - directory where you can add rally plugins. So you don't need
+  to merge benchmark in scenarios in rally to be able to run them in heat.
+* extra - all files from this directory will be copied to gates, so you will
+  be able to use absolute path in rally tasks. Files will be in ~/.rally/extra/*
+
+
+* more about rally: https://wiki.openstack.org/wiki/Rally
+* how to add rally-gates: https://wiki.openstack.org/wiki/Rally/RallyGates
+* how to write plugins https://rally.readthedocs.org/en/latest/plugins.html

rally-scenarios/extra/README.rst

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+All files from this directory will be copied to gates, so you will be able
+to use absolute path in rally tasks. Files will be in ~/.rally/extra/*

rally-scenarios/heat-fakevirt.yaml

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+---
+  HeatStacks.create_and_list_stack:
+    -
+      runner:
+        type: "constant"
+        times: 2000
+        concurrency: 20
+      context:
+        users:
+          tenants: 30
+          users_per_tenant: 1
+
+  HeatStacks.create_and_delete_stack:
+    -
+      runner:
+        type: "constant"
+        times: 200
+        concurrency: 20
+      context:
+        users:
+          tenants: 10
+          users_per_tenant: 3

rally-scenarios/plugins/sample_plugin.py

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+# Copyright 2014 Mirantis Inc.
+# 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.
+
+"""Sample plugin for Heat.
+
+For more Heat related benchmarks take a look here:
+http://github.com/stackforge/rally/blob/master/rally/benchmark/scenarios/heat/
+
+About plugins: https://rally.readthedocs.org/en/latest/plugins.html
+
+Rally concepts https://wiki.openstack.org/wiki/Rally/Concepts
+"""
+
+
+from rally.benchmark.scenarios import base
+
+
+class HeatPlugin(base.Scenario):
+
+    @base.scenario(context={"cleanup": ["heat"]})
+    def list_benchmark(self, container_format,
+                            image_location, disk_format, **kwargs):
+        """Get heatclient and do whatever."""
+        stacks = list(self.clients("heat").stacks.list())