test: provide "path" instead of "dir" fixture for old pytest-vcr

Author: dgw

conftest.py

@@ -36,3 +36,10 @@ def vcr_cassette_dir(request):
         # We know it's part of Sopel...
         parts = parts[1:]
     return os.path.join('test', 'vcr', *parts)
+
+
+@pytest.fixture(scope='module')
+def vcr_cassette_path(request):
+    # pytest-vcr 0.3.0 looks for this fixture name
+    # remove when killing off Python 3.3 support
+    return vcr_cassette_dir(request)