Ignore pylint errors caused by compatibility checks for six

* This is a temporary measure until we stop covering Python2
* Remove standalone ansible-lint tests since it is covered by ansible-test

Signed-off-by: saito-hideki <saito@fgrep.org>

tests/sanity/ignore-2.20.txt

@@ -1 +1,10 @@
 tests/utils/shippable/timing.py shebang
+plugins/action/synchronize.py pylint:ansible-bad-import-from
+plugins/callback/cgroup_perf_recap.py pylint:ansible-bad-import-from
+plugins/modules/mount.py pylint:ansible-bad-import-from
+plugins/modules/sysctl.py pylint:ansible-bad-import-from
+plugins/shell/csh.py pylint:ansible-bad-import-from
+plugins/shell/fish.py pylint:ansible-bad-import-from
+tests/unit/mock/procenv.py pylint:ansible-bad-import-from
+tests/unit/mock/yaml_helper.py pylint:ansible-bad-import-from
+tests/unit/modules/conftest.py pylint:ansible-bad-import-from

tests/utils/shippable/lint.sh

@@ -1,14 +0,0 @@
-#!/usr/bin/env bash
-
-set -o pipefail -eux
-
-echo "${PATH/\~/${HOME}}"
-echo "${HOME}"
-command -v ansible
-
-pip install --upgrade --user pip
-pip install --upgrade --user ansible-lint
-
-PATH="${PATH/\~/${HOME}}" ansible-lint \
-                                    --exclude changelogs/ \
-                                    --profile=production