Add ignores necessary for ansible-core 2.20 if Python 2.7 is still supported by the collection. (#176)

Author: felixfontein

tests/sanity/ignore-2.20.txt

@@ -1 +1,4 @@
+plugins/module_utils/api.py pylint:ansible-bad-import-from
+plugins/module_utils/robot.py pylint:ansible-bad-import-from
+plugins/plugin_utils/unsafe.py pylint:ansible-bad-import-from
 tests/ee/roles/smoke/library/smoke_ipaddress.py shebang