Add Rally jobs related files to Murano

Add files that allow the Rally job (will be added in a separated infra patch)
work properly.

For more info, see the README files.


Change-Id: I58bd59889df51e5ec13d9135aa9a886a05a6efc0

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-murano.yaml** is a task that will be run in gates against OpenStack deployed
+  by DevStack with installed Rally & Murano.
+
+* **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, which
+  makes it possible to use absolute paths 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, which makes it
+possible to use absolute paths in rally tasks. Files will be in ~/.rally/extra/*

rally-jobs/extra/applications/README.rst

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+Murano applications
+===================
+
+Files for Murano benchmarking
+
+Structure
+---------
+
+* <application_name>/ directories. Each directory stores a simple Murano package
+  that is used to prepare the Murano context that is used to deploy an environment
+  with a package. Other files needed for applications can be placed here as well.
+
+
+Useful links
+------------
+
+* More about Murano: http://murano.readthedocs.org/

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 the Rally code base.
+
+Note, however, that it is better to push all interesting and useful benchmarks
+to the Rally code base: this simplifies administration for Operators.

rally-jobs/task-murano.yaml

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+---
+  MuranoEnvironments.list_environments:
+    -
+      runner:
+        type: "constant"
+        times: 30
+        concurrency: 4
+      context:
+        users:
+          tenants: 2
+          users_per_tenant: 2
+      sla:
+        failure_rate:
+          max: 0
+
+  MuranoEnvironments.create_and_delete_environment:
+    -
+      runner:
+        type: "constant"
+        times: 20
+        concurrency: 2
+      context:
+        users:
+          tenants: 2
+          users_per_tenant: 2
+      sla:
+        failure_rate:
+          max: 0