Python 3.8 collections compatibility fixes.

Includes a new pylint blacklist plugin to prevent regressions.

lib/ansible/plugins/callback/__init__.py

@@ -26,9 +26,9 @@ import sys
 import warnings
 
 from copy import deepcopy
-from collections import MutableMapping
 
 from ansible import constants as C
+from ansible.module_utils.common._collections_compat import MutableMapping
 from ansible.parsing.ajson import AnsibleJSONEncoder
 from ansible.plugins import AnsiblePlugin, get_plugin_class
 from ansible.utils.color import stringc

lib/ansible/plugins/callback/dense.py

@@ -20,8 +20,6 @@ requirements:
 - set as stdout in configuation
 '''
 
-from collections import MutableMapping, MutableSequence
-
 HAS_OD = False
 try:
     from collections import OrderedDict
@@ -30,6 +28,7 @@ except ImportError:
     pass
 
 from ansible.module_utils.six import binary_type, text_type
+from ansible.module_utils.common._collections_compat import MutableMapping, MutableSequence
 from ansible.plugins.callback.default import CallbackModule as CallbackModule_default
 from ansible.utils.color import colorize, hostcolor
 

lib/ansible/plugins/callback/log_plays.py

@@ -21,9 +21,9 @@ DOCUMENTATION = '''
 import os
 import time
 import json
-from collections import MutableMapping
 
 from ansible.module_utils._text import to_bytes
+from ansible.module_utils.common._collections_compat import MutableMapping
 from ansible.plugins.callback import CallbackBase