Patch prepares ground for further work on tripleo_validations
Datastructures used for testing were factored out.
__init__.py files for lookup plugins and library tests were added.
Together with minimal docstring.
.gitingore was updated to ignore stestr files.
test-requirements.txt and requirements.txt were updated to include
all necessary dependencies
Signed-off-by: Jiri Podivin <email@example.com>