Tempest scenario - execute a dummy strategy

This patchset implements the first scenario for Watcher which does
the following actions:

- create an audit template with the dummy strategy
- run the audit to create an action plan
- get the action plan
- run the action plan
- get results and make sure it succeeded

Partially Implements: blueprint tempest-basic-set-up

Change-Id: Iee74ede0bd1bcd03e8938f2ec8c6884f99e7f99a

watcher_tempest_plugin/README.rst

@@ -84,6 +84,9 @@ For Keystone V2::
     admin_password = <ADMIN_PASSWORD>
     auth_version = v2
 
+In both cases::
+    public_network_id = <PUBLIC_NETWORK_ID>
+
 
 For more information, please refer to: