Remove unused utilities

Author: jeromekelleher

tests/test_vcf_utils.py

@@ -1,13 +1,10 @@
 import pathlib
 
 import pytest
-from cyvcf2 import VCF
 import numpy as np
 
 from bio2zarr import vcf_utils
 
-from .utils import count_variants, path_for_test
-
 data_path = pathlib.Path("tests/data/vcf/")