Break apart a looped dependency to show a warning when parsing playbooks

Display a warning when a dict key is overwritten by pyyaml
Fixes #12888

test/units/mock/loader.py

@@ -22,7 +22,7 @@ __metaclass__ = type
 import os
 
 from ansible.errors import AnsibleParserError
-from ansible.parsing import DataLoader
+from ansible.parsing.dataloader import DataLoader
 
 class DictDataLoader(DataLoader):
 

test/units/parsing/test_data_loader.py

@@ -26,7 +26,7 @@ from ansible.compat.tests import unittest
 from ansible.compat.tests.mock import patch, mock_open
 from ansible.errors import AnsibleParserError
 
-from ansible.parsing import DataLoader
+from ansible.parsing.dataloader import DataLoader
 from ansible.parsing.yaml.objects import AnsibleMapping
 
 class TestDataLoader(unittest.TestCase):

test/units/parsing/test_unquote.py

@@ -23,7 +23,7 @@ __metaclass__ = type
 from nose import tools
 from ansible.compat.tests import unittest
 
-from ansible.parsing.splitter import unquote
+from ansible.parsing.quoting import unquote
 
 
 # Tests using nose's test generators cannot use unittest base class.