Move collections abc shim to _collections_compat

lib/ansible/module_utils/common/_collections_compat.py

@@ -0,0 +1,29 @@
+# Copyright (c), Sviatoslav Sydorenko <ssydoren@redhat.com> 2018
+# Simplified BSD License (see licenses/simplified_bsd.txt or https://opensource.org/licenses/BSD-2-Clause)
+"""Collections ABC import shim.
+
+This module is intended only for internal use.
+It will go away once the bundled copy of six includes equivalent functionality.
+Third parties should not use this.
+"""
+
+from __future__ import absolute_import, division, print_function
+__metaclass__ = type
+
+
+try:
+    """Python 3.3+ branch."""
+    from collections.abc import (
+        deque, KeysView,
+        Mapping, MutableMapping,
+        Sequence, MutableSequence,
+        Set, MutableSet,
+    )
+except ImportError:
+    """Use old lib location under 2.6-3.2."""
+    from collections import (
+        deque, KeysView,
+        Mapping, MutableMapping,
+        Sequence, MutableSequence,
+        Set, MutableSet,
+    )