Python 3.8 collections compatibility fixes.

Includes a new pylint blacklist plugin to prevent regressions.

lib/ansible/modules/files/xml.py

@@ -266,7 +266,6 @@ import os
 import re
 import traceback
 
-from collections import MutableMapping
 from distutils.version import LooseVersion
 from io import BytesIO
 
@@ -279,6 +278,7 @@ except ImportError:
 from ansible.module_utils.basic import AnsibleModule, json_dict_bytes_to_unicode
 from ansible.module_utils.six import iteritems, string_types
 from ansible.module_utils._text import to_bytes, to_native
+from ansible.module_utils.common._collections_compat import MutableMapping
 
 _IDENT = r"[a-zA-Z-][a-zA-Z0-9_\-\.]*"
 _NSIDENT = _IDENT + "|" + _IDENT + ":" + _IDENT

lib/ansible/modules/net_tools/basics/uri.py

@@ -270,11 +270,11 @@ import sys
 import tempfile
 import traceback
 
-from collections import Mapping, Sequence
 from ansible.module_utils.basic import AnsibleModule
 from ansible.module_utils.six import PY2, iteritems, string_types
 from ansible.module_utils.six.moves.urllib.parse import urlencode, urlsplit
 from ansible.module_utils._text import to_native, to_text
+from ansible.module_utils.common._collections_compat import Mapping, Sequence
 from ansible.module_utils.urls import fetch_url, url_argument_spec
 
 JSON_CANDIDATES = ('text', 'json', 'javascript')