Rename tests to test, use old directory name.

test/README.md

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+Ansible Test System
+===================
+
+Folders
+
+unit
+----
+
+Unit tests that test small pieces of code not suited for the integration test layer, usually very API based, and should leverage
+mock interfaces rather than producing side effects.
+
+Playbook engine code is better suited for integration tests.
+
+integration
+-----------
+
+Integration test layer, constructed using playbooks.
+
+Some tests may require cloud credentials, others will not, and destructive tests are seperated from non-destructive so a subset
+can be run on development machines.
+
+learn more
+----------
+
+hop into a subdirectory and see the associated README.md for more info.
+
+
+