fix unittest python v3.10 support

warden_server/test_warden_server.py

@@ -8,11 +8,15 @@ import sys
 import warnings
 from os import path
 from copy import deepcopy
-import unittest2 as unittest
 import MySQLdb as my
 from warden_server import build_server
 import warden_server
 
+if sys.version_info >= (3, 10):
+    import unittest
+else:
+    import unittest2
+
 if sys.version_info[0] >= 3:
     from io import StringIO
 else: