Move unit test compat code out of lib/ansible/. (#46996)

* Move ansible.compat.tests to test/units/compat/.
* Fix unit test references to ansible.compat.tests.
* Move builtins compat to separate file.
* Fix classification of test/units/compat/ dir.

test/units/module_utils/network/aci/test_aci.py

@@ -20,7 +20,7 @@
 
 import sys
 
-from ansible.compat.tests import unittest
+from units.compat import unittest
 from ansible.module_utils.network.aci.aci import ACIModule
 from ansible.module_utils.six import PY2, PY3
 from ansible.module_utils._text import to_native

test/units/module_utils/network/common/test_parsing.py

@@ -20,7 +20,7 @@
 from __future__ import absolute_import, division, print_function
 __metaclass__ = type
 
-from ansible.compat.tests import unittest
+from units.compat import unittest
 from ansible.module_utils.network.common.parsing import Conditional
 
 test_results = ['result_1', 'result_2', 'result_3']

test/units/module_utils/network/ftd/test_configuration.py

@@ -16,8 +16,8 @@
 # along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
 #
 
-from ansible.compat.tests import mock
-from ansible.compat.tests.mock import call, patch
+from units.compat import mock
+from units.compat.mock import call, patch
 from ansible.module_utils.network.ftd.configuration import iterate_over_pageable_resource, BaseConfigurationResource
 
 

test/units/module_utils/network/nos/test_nos.py

@@ -24,7 +24,7 @@ import json
 
 from mock import MagicMock, patch, call
 
-from ansible.compat.tests import unittest
+from units.compat import unittest
 from ansible.module_utils.network.nos import nos
 
 

test/units/module_utils/network/nso/test_nso.py

@@ -20,8 +20,8 @@ from __future__ import (absolute_import, division, print_function)
 
 import json
 
-from ansible.compat.tests.mock import patch
-from ansible.compat.tests import unittest
+from units.compat.mock import patch
+from units.compat import unittest
 from ansible.module_utils.network.nso import nso
 
 

test/units/module_utils/network/slxos/test_slxos.py

@@ -24,7 +24,7 @@ import json
 
 from mock import MagicMock, patch, call
 
-from ansible.compat.tests import unittest
+from units.compat import unittest
 from ansible.module_utils.network.slxos import slxos