Denote unit test requirements in README.md

test/README.md

@@ -2,6 +2,7 @@ Ansible Test System
 ===================
 
 Folders
+=======
 
 unit
 ----
@@ -11,6 +12,8 @@ mock interfaces rather than producing side effects.
 
 Playbook engine code is better suited for integration tests.
 
+Requirements: sudo pip install paramiko PyYAML jinja2 httplib2 passlib
+
 integration
 -----------