tests: make fixtures available via conftest.py

closes #1592

tests/test_dnfile_features.py

@@ -5,9 +5,7 @@
 # Unless required by applicable law or agreed to in writing, software distributed under the License
 #  is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and limitations under the License.
-
 import fixtures
-from fixtures import scope, sample
 
 
 @fixtures.parametrize(