Tests: minor fixes.

test/conftest.py

@@ -1,16 +1,17 @@
 import fcntl
 import os
 import platform
-import pytest
+import re
 import shutil
 import signal
 import stat
 import subprocess
 import sys
-import re
 import tempfile
 import time
 
+import pytest
+
 from unit.check.go import check_go
 from unit.check.node import check_node
 from unit.check.tls import check_openssl