Add Rally jobs related files to Mistral

To make Rally job work properly this patch adds all required files

As well it adds README that explains how it works

Change-Id: Ia196f1437c14f28fff3d66540d0591629e18bd5c

rally-jobs/README.rst

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+Rally job related files
+=======================
+
+This directory contains rally tasks and plugins that are run by OpenStack CI.
+
+Structure
+---------
+
+* task-mistral.yaml is a task that will be run in gates against OpenStack deployed
+  by DevStack with installed Rally & Mistral.
+
+* plugins - directory where you can add rally plugins. Almost everything in
+  Rally is plugin. Benchmark context, Benchmark scenario, SLA checks, Generic
+  cleanup resources, ....
+
+* extra - all files from this directory will be copy pasted to gates, so you
+  are able to use absolute path in rally tasks.
+  Files will be in ~/.rally/extra/*
+
+
+Useful links
+------------
+
+* More about rally: https://rally.readthedocs.org/en/latest/
+
+* How to add rally-gates: https://rally.readthedocs.org/en/latest/gates.html
+
+* About plugins:  https://rally.readthedocs.org/en/latest/plugins.html
+

rally-jobs/extra/README.rst

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

rally-jobs/extra/mistral_wb.yaml

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+---
+version: "2.0"
+
+name: wb
+
+workflows:
+  wf1:
+    type: direct
+    tasks:
+      hello:
+        action: std.echo output="Hello"
+        publish:
+            result: $

rally-jobs/plugins/README.rst

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+Rally plugins
+=============
+
+All *.py modules from this directory will be auto-loaded by Rally and all
+plugins will be discoverable. There is no need of any extra configuration
+and there is no difference between writing them here and in rally code base.
+
+Note that it is better to push all interesting and useful benchmarks to Rally
+code base, this simplifies administration for Operators.

rally-jobs/task-mistral.yaml

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+---
+  MistralWorkbooks.list_workbooks:
+    -
+      runner:
+        type: "constant"
+        times: 50
+        concurrency: 10
+      context:
+        users:
+          tenants: 1
+          users_per_tenant: 1
+      sla:
+        failure_rate:
+          max: 0
+
+  MistralWorkbooks.create_workbook:
+    -
+      args:
+        definition: "/home/jenkins/.rally/extra/mistral_wb.yaml"
+      runner:
+        type: "constant"
+        times: 50
+        concurrency: 10
+      context:
+        users:
+          tenants: 1
+          users_per_tenant: 1
+      sla:
+        failure_rate:
+          max: 0
+
+    -
+      args:
+        definition: "/home/jenkins/.rally/extra/mistral_wb.yaml"
+        do_delete: true
+      runner:
+        type: "constant"
+        times: 50
+        concurrency: 10
+      context:
+        users:
+          tenants: 1
+          users_per_tenant: 1
+      sla:
+        failure_rate:
+          max: 0
+