Run fast script linters before heavier analysis

Includes two small scripts: verify-bash.sh for running shellcheck, and
verify-python.sh for running pylint.

.pylint rc files is a default configuration file generated by
pylint 2.3.1, with one change (min-similarity-lines changed
from 4 to 10).

scripts/verify-python.sh

@@ -0,0 +1,20 @@
+#!/bin/bash
+
+# Copyright (c) 2019 Patryk Obara <patryk.obara@gmail.com>
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+# This script exists only to easily run python static checker on all files in
+# the repo.  You can pass additional parameters to this script itself, e.g.:
+#
+# $ ./verify-python.sh --disable=<msg_ids>
+
+run_pylint () {
+	git ls-files \
+		| xargs file \
+		| grep "Python script" \
+		| cut -d ':' -f 1 \
+		| xargs -L 1000 pylint "$@"
+}
+
+pylint --version
+run_pylint --rcfile="$(git rev-parse --show-toplevel)/.pylint" "$@"