Mark credentials_factory stable for plugins
Add unit tests for credentials_factory and mark it stable for
plugins. This is part of the work to make tempest/test.py stable
for plugins.
Change-Id: I99414cb2704ce5469fcb66406b6905e2d1871dba
diff --git a/doc/source/plugin.rst b/doc/source/plugin.rst
index b3af92f..77ef9ed 100644
--- a/doc/source/plugin.rst
+++ b/doc/source/plugin.rst
@@ -28,6 +28,7 @@
* tempest.lib.*
* tempest.config
* tempest.test_discover.plugins
+* tempest.common.credentials_factory
If there is an interface from tempest that you need to rely on in your plugin
which is not listed above, it likely needs to be migrated to tempest.lib. In