Skip ios_acls unit test on Python 3.5.

test/units/modules/network/ios/test_ios_acls.py

@@ -6,6 +6,15 @@
 from __future__ import (absolute_import, division, print_function)
 __metaclass__ = type
 
+import sys
+
+import pytest
+
+# These tests and/or the module under test are unstable on Python 3.5.
+# See: https://app.shippable.com/github/ansible/ansible/runs/161331/15/tests
+# This is most likely due to CPython 3.5 not maintaining dict insertion order.
+pytestmark = pytest.mark.skipif(sys.version_info[:2] == (3, 5), reason="Tests and/or module are unstable on Python 3.5.")
+
 from units.compat.mock import patch
 from ansible.modules.network.ios import ios_acls
 from units.modules.utils import set_module_args