Drop compat implementations for tests

Python < 3.4.4 has already reached its EOL.

Change-Id: Ieb7cfd796991645db44dafc0e5ba82855c08853a

tests/unit/mock/path.py

@@ -1,4 +1,5 @@
-from ansible_collections.openstack.cloud.tests.unit.compat.mock import MagicMock
+from unittest.mock import MagicMock
+
 from ansible.utils.path import unfrackpath
 
 

tests/unit/mock/procenv.py

@@ -20,10 +20,10 @@
 
 import sys
 import json
+import unittest
 
 from contextlib import contextmanager
 from io import BytesIO, StringIO
-from ansible_collections.openstack.cloud.tests.unit.compat import unittest
 from ansible.module_utils.six import PY3
 from ansible.module_utils._text import to_bytes