Tcms-api

This version is compatible only with Kiwi TCMS v8.0 or later!

- Do not use deprecated field ``product`` in ``TestCase.create`` API
method
- Set ``TestCase.is_automated`` to ``True``

This version is compatible only with Kiwi TCMS v8.0 or later!

- Adjusts ``plugin_helpers`` module to reflect backwards incompatible
API changes introduced in Kiwi TCMS v8.0

- Fix a bug in how ``use_mod_kerb`` setting was evaluated which
lead to always preferring Kerberos which in turn was causing
issues on Windows.