Hackebrot convert test cookiecutter local no input

Convert `test_main.TestCookiecutterLocalNoInput` to `py.test` syntax this time using a parametrized fixture for two of the tests (slash/no-slash).
Apparently the original implementation did not run the teardown of `CookiecutterCleanSystemTestCase` since it is missing the super teardown (`TestCookiecutterLocalWithInput` doesn't call it neither).

My re-implementation does, which is correct I guess. Do you agree?