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/parsing/test_dataloader.py

@@ -21,8 +21,8 @@ __metaclass__ = type
 
 import os
 
-from ansible.compat.tests import unittest
-from ansible.compat.tests.mock import patch, mock_open
+from units.compat import unittest
+from units.compat.mock import patch, mock_open
 from ansible.errors import AnsibleParserError, yaml_strings
 from ansible.module_utils._text import to_text
 from ansible.module_utils.six import PY3

test/units/parsing/utils/test_jsonify.py

@@ -19,7 +19,7 @@
 from __future__ import (absolute_import, division, print_function)
 __metaclass__ = type
 
-from ansible.compat.tests import unittest
+from units.compat import unittest
 from ansible.parsing.utils.jsonify import jsonify
 
 

test/units/parsing/vault/test_vault.py

@@ -29,8 +29,8 @@ import tempfile
 from binascii import hexlify
 import pytest
 
-from ansible.compat.tests import unittest
-from ansible.compat.tests.mock import patch, MagicMock
+from units.compat import unittest
+from units.compat.mock import patch, MagicMock
 
 from ansible import errors
 from ansible.module_utils import six

test/units/parsing/vault/test_vault_editor.py

@@ -25,8 +25,8 @@ import tempfile
 
 import pytest
 
-from ansible.compat.tests import unittest
-from ansible.compat.tests.mock import patch
+from units.compat import unittest
+from units.compat.mock import patch
 
 from ansible import errors
 from ansible.parsing import vault

test/units/parsing/yaml/test_dumper.py

@@ -20,7 +20,7 @@ __metaclass__ = type
 
 import io
 
-from ansible.compat.tests import unittest
+from units.compat import unittest
 from ansible.parsing import vault
 from ansible.parsing.yaml import dumper, objects
 from ansible.parsing.yaml.loader import AnsibleLoader

test/units/parsing/yaml/test_loader.py

@@ -22,7 +22,7 @@ __metaclass__ = type
 
 from io import StringIO
 
-from ansible.compat.tests import unittest
+from units.compat import unittest
 
 from ansible import errors
 from ansible.module_utils.six import text_type, binary_type

test/units/parsing/yaml/test_objects.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.errors import AnsibleError