Initial skeleton for devstack-tempest base job

Setup the initial folder and play to run tempest.
This simply runs tempest full for now, with not support for config
options.

Change-Id: I5a76dd23900a1b5fb1764fafd837d69baf9ed8b1
Depends-on: Iffe54fbccbccd68db08f79a1b51dd7f76dbff408
diff --git a/roles/run-tempest/README.rst b/roles/run-tempest/README.rst
new file mode 100644
index 0000000..a75fc31
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+Run Tempest
+
+**Role Variables**
+
+.. zuul:rolevar:: devstack_base_dir
+   :default: /opt/stack
+
+   The devstack base directory.
+
+.. zuul:rolevar:: tempest_concurrency
+   :default: 0
+
+   The number of parallel test processes.
+
+.. zuul:rolevar:: tox_venvlist
+   :default: smoke
+
+   The Tempest tox environment to run.