Remove unit test Python 2.6 compat. (#78369)

test/units/compat/unittest.py

@@ -19,22 +19,9 @@
 from __future__ import (absolute_import, division, print_function)
 __metaclass__ = type
 
-'''
-Compat module for Python2.7's unittest module
-'''
-
-import sys
-
 # Allow wildcard import because we really do want to import all of
 # unittests's symbols into this compat shim
 # pylint: disable=wildcard-import,unused-wildcard-import
-if sys.version_info < (2, 7):
-    try:
-        # Need unittest2 on python2.6
-        from unittest2 import *
-    except ImportError:
-        print('You need unittest2 installed on python2.6.x to run tests')
-else:
 from unittest import *
 
 if not hasattr(TestCase, 'assertRaisesRegex'):

test/units/requirements.txt

@@ -2,4 +2,3 @@ bcrypt ; python_version >= '3.8'  # controller only
 passlib ; python_version >= '3.8'  # controller only
 pexpect ; python_version >= '3.8'  # controller only
 pywinrm ; python_version >= '3.8'  # controller only
-unittest2 ; python_version < '2.7'