Convert datadir pytest into CI tests

[AbcSxyZ]

Convert test from #25 to CI tests using integration test framework.

def test_datadir(hook, host):
    """
    Verify if datadir can be changed and created proprely.

    Verify datadir metada, if it's owned by script user (dogecoin).
    """
    # Use a unique directory for this test
    tmp_datadir = "/tmp/datadir_test"
    datadir_argument = f"-datadir={tmp_datadir}"

    test_args = ["dogecoind", datadir_argument]
    test_environ = {}

    result_args = [
            pytest.abs_path("dogecoind"),
            datadir_argument,
            "-printtoconsole",
            ]
    result_environ = {}

    # Run test to generate datadir
    hook.test(test_args, test_environ, result_args, result_environ)
    assert hook.result == hook.reference

    # Test datadir metadata
    datadir_folder = host.file(tmp_datadir)
    assert datadir_folder.user == pytest.user
    assert datadir_folder.group == pytest.user
    assert datadir_folder.mode == 0o755